diff --git a/scripting/erm/ERMInterpreter.cpp b/scripting/erm/ERMInterpreter.cpp
index 76de8520e..d60511024 100644
--- a/scripting/erm/ERMInterpreter.cpp
+++ b/scripting/erm/ERMInterpreter.cpp
@@ -464,8 +464,8 @@ void ERMInterpreter::scanScripts()
 ERMInterpreter::ERMInterpreter()
 {
 	erm = this;
-	curFunc = NULL;
-	curTrigger = NULL;
+	curFunc = nullptr;
+	curTrigger = nullptr;
 	globalEnv = new Environment();
 	topDyn = globalEnv;
 }
@@ -496,7 +496,7 @@ void ERMInterpreter::executeTrigger( VERMInterpreter::Trigger & trig, int funNum
 		executeLine(lp);
 	}
 
-	curFunc = NULL;
+	curFunc = nullptr;
 }
 
 bool ERMInterpreter::isATrigger( const ERM::TLine & line )
@@ -686,8 +686,8 @@ struct HE_BPerformer : StandardBodyOptionItemVisitor<HEPerformer>
 	{}
 	using StandardBodyOptionItemVisitor<HEPerformer>::operator();
 
-	void operator()(TIexp const& cmp) const OVERRIDE;
-	void operator()(TVarpExp const& cmp) const OVERRIDE;
+	void operator()(TIexp const& cmp) const override;
+	void operator()(TVarpExp const& cmp) const override;
 };
 
 template<int opcode>
@@ -703,8 +703,8 @@ struct HE_CPerformer : StandardBodyOptionItemVisitor<HEPerformer>
 	{}
 	using StandardBodyOptionItemVisitor<HEPerformer>::operator();
 
-	void operator()(TIexp const& cmp) const OVERRIDE;
-	void operator()(TVarpExp const& cmp) const OVERRIDE;
+	void operator()(TIexp const& cmp) const override;
+	void operator()(TVarpExp const& cmp) const override;
 };
 
 template<int opcode>
@@ -719,7 +719,7 @@ struct HEPerformer : StandardReceiverVisitor<const CGHeroInstance *>
 	{}
 	using StandardReceiverVisitor<const CGHeroInstance *>::operator();
 
-	void operator()(TNormalBodyOption const& trig) const OVERRIDE
+	void operator()(TNormalBodyOption const& trig) const override
 	{
 		switch(trig.optionCode)
 		{
@@ -780,7 +780,7 @@ struct IF_MPerformer : StandardBodyOptionItemVisitor<IFPerformer>
 	explicit IF_MPerformer(IFPerformer & _owner) : StandardBodyOptionItemVisitor<IFPerformer>(_owner){}
 	using StandardBodyOptionItemVisitor<IFPerformer>::operator();
 
-	void operator()(TStringConstant const& cmp) const OVERRIDE;
+	void operator()(TStringConstant const& cmp) const override;
 };
 
 
@@ -802,7 +802,7 @@ struct StringFormatter
 {
 	int pos;
 	int tokenLength;
-	int percentPos;
+	size_t percentPos;
 	int charsToReplace;
 	std::string &msg;
 
@@ -821,7 +821,7 @@ struct StringFormatter
 	{
 		int toAdd = 0;
 		int numStart = percentPos + 2;
-		int numEnd = msg.find_first_not_of("1234567890", numStart);
+		size_t numEnd = msg.find_first_not_of("1234567890", numStart);
 
 		if(numEnd == std::string::npos)
 			toAdd = msg.size() - numStart;
@@ -887,7 +887,7 @@ struct IFPerformer : StandardReceiverVisitor<TUnusedType>
 	using StandardReceiverVisitor<TUnusedType>::operator();
 
 
-	void operator()(TNormalBodyOption const& trig) const OVERRIDE
+	void operator()(TNormalBodyOption const& trig) const override
 	{
 		std::string message; //to be shown
 		switch(trig.optionCode)
@@ -932,8 +932,8 @@ struct MA_PPerformer : StandardBodyOptionItemVisitor<MAPerformer>
 	explicit MA_PPerformer(MAPerformer & _owner);
 	using StandardBodyOptionItemVisitor<MAPerformer>::operator();
 
-	void operator()(TIexp const& cmp) const OVERRIDE;
-	void operator()(TVarpExp const& cmp) const OVERRIDE;
+	void operator()(TIexp const& cmp) const override;
+	void operator()(TVarpExp const& cmp) const override;
 };
 
 struct MAPerformer : StandardReceiverVisitor<TUnusedType>
@@ -942,7 +942,7 @@ struct MAPerformer : StandardReceiverVisitor<TUnusedType>
 	{}
 	using StandardReceiverVisitor<TUnusedType>::operator();
 
-	void operator()(TNormalBodyOption const& trig) const OVERRIDE
+	void operator()(TNormalBodyOption const& trig) const override
 	{
 		switch(trig.optionCode)
 		{
@@ -981,8 +981,8 @@ struct MO_GPerformer : StandardBodyOptionItemVisitor<MOPerformer>
 	{}
 	using StandardBodyOptionItemVisitor<MOPerformer>::operator();
 
-	void operator()(TVarpExp const& cmp) const OVERRIDE;
-	void operator()(TIexp const& cmp) const OVERRIDE;
+	void operator()(TVarpExp const& cmp) const override;
+	void operator()(TIexp const& cmp) const override;
 };
 
 struct MOPerformer: StandardReceiverVisitor<int3>
@@ -991,7 +991,7 @@ struct MOPerformer: StandardReceiverVisitor<int3>
 	{}
 	using StandardReceiverVisitor<int3>::operator();
 
-	void operator()(TNormalBodyOption const& trig) const OVERRIDE
+	void operator()(TNormalBodyOption const& trig) const override
 	{
 		switch(trig.optionCode)
 		{
@@ -1116,8 +1116,8 @@ struct VR_SPerformer : StandardBodyOptionItemVisitor<VRPerformer>
 	explicit VR_SPerformer(VRPerformer & _owner);
 	using StandardBodyOptionItemVisitor<VRPerformer>::operator();
 
-	void operator()(TStringConstant const& cmp) const OVERRIDE;
-	void operator()(TIexp const& cmp) const OVERRIDE;
+	void operator()(TStringConstant const& cmp) const override;
+	void operator()(TIexp const& cmp) const override;
 };
 
 struct VRPerformer : StandardReceiverVisitor<IexpValStr>
@@ -1125,7 +1125,7 @@ struct VRPerformer : StandardReceiverVisitor<IexpValStr>
 	VRPerformer(ERMInterpreter * _interpr, IexpValStr ident) : StandardReceiverVisitor<IexpValStr>(_interpr, ident)
 	{}
 
-	void operator()(TVRLogic const& trig) const OVERRIDE
+	void operator()(TVRLogic const& trig) const override
 	{
 		int valr = interp->getIexp(trig.var).getInt();
 		switch (trig.opcode)
@@ -1144,7 +1144,7 @@ struct VRPerformer : StandardReceiverVisitor<IexpValStr>
 			break;
 		}
 	}
-	void operator()(TVRArithmetic const& trig) const OVERRIDE
+	void operator()(TVRArithmetic const& trig) const override
 	{
 		IexpValStr rhs = interp->getIexp(trig.rhs);
 		switch (trig.opcode)
@@ -1169,7 +1169,7 @@ struct VRPerformer : StandardReceiverVisitor<IexpValStr>
 			break;
 		}
 	}
-	void operator()(TNormalBodyOption const& trig) const OVERRIDE
+	void operator()(TNormalBodyOption const& trig) const override
 	{
 		switch(trig.optionCode)
 		{
@@ -1380,7 +1380,7 @@ struct ERMExpDispatch : boost::static_visitor<>
 		}
 		else if(trig.name == "HE")
 		{
-			const CGHeroInstance * hero = NULL;
+			const CGHeroInstance * hero = nullptr;
 			if(trig.identifier.is_initialized())
 			{
 				ERM::Tidentifier tid = trig.identifier.get();
@@ -1754,11 +1754,11 @@ struct LVL3BodyOptionItemVisitor : StandardBodyOptionItemVisitor<IexpValStr>
 	{}
 	using StandardBodyOptionItemVisitor<IexpValStr>::operator();
 
-	void operator()(TIexp const& cmp) const OVERRIDE
+	void operator()(TIexp const& cmp) const override
 	{
 		owner = erm->getIexp(cmp);
 	}
-	void operator()(TVarpExp const& cmp) const OVERRIDE
+	void operator()(TVarpExp const& cmp) const override
 	{
 		owner = erm->getIexp(cmp);
 	}
@@ -2717,7 +2717,7 @@ struct VEvaluator : boost::static_visitor<VOption>
 	}
 };
 
-VOption ERMInterpreter::eval( VOption line, Environment * env /*= NULL*/ )
+VOption ERMInterpreter::eval( VOption line, Environment * env /*= nullptr*/ )
 {
 // 	if(line.children.isNil())
 // 		return;
@@ -2729,7 +2729,7 @@ VOption ERMInterpreter::eval( VOption line, Environment * env /*= NULL*/ )
 
 }
 
-VOptionList ERMInterpreter::evalEach( VermTreeIterator list, Environment * env /*= NULL*/ )
+VOptionList ERMInterpreter::evalEach( VermTreeIterator list, Environment * env /*= nullptr*/ )
 {
 	VOptionList ret;
 	for(int g=0; g<list.size(); ++g)
diff --git a/scripting/erm/ERMInterpreter.h b/scripting/erm/ERMInterpreter.h
index 99177de4b..2e2671684 100644
--- a/scripting/erm/ERMInterpreter.h
+++ b/scripting/erm/ERMInterpreter.h
@@ -23,7 +23,7 @@ namespace VERMInterpreter
 	{
 		std::string problem;
 	public:
-		const char * what() const throw() OVERRIDE
+		const char * what() const throw() override
 		{
 			return problem.c_str();
 		}
@@ -216,7 +216,7 @@ namespace VERMInterpreter
 
 		int realLineNum;
 
-		LinePointer() : file(NULL)
+		LinePointer() : file(nullptr)
 		{}
 
 		LinePointer(const FileInfo * finfo, int line, int _realLineNum) : file(finfo), lineNum(line),
@@ -281,7 +281,7 @@ namespace VERMInterpreter
 		LinePointer line;
 		TriggerLocalVars ermLocalVars;
 		Stack * stack; //where we are stuck at execution
-		Trigger() : stack(NULL)
+		Trigger() : stack(nullptr)
 		{}
 	};
 
@@ -468,7 +468,7 @@ namespace VERMInterpreter
 		Environment * parent;
 
 	public:
-		Environment() : parent(NULL)
+		Environment() : parent(nullptr)
 		{}
 		void setPatent(Environment * _parent);
 		Environment * getPatent() const;
@@ -503,7 +503,7 @@ namespace VERMInterpreter
 	public:
 		VermTreeIterator(VOptionList & _parent) : parent(&_parent), state(NORM), basePos(0)
 		{}
-		VermTreeIterator() : parent(NULL), state(NORM)
+		VermTreeIterator() : parent(nullptr), state(NORM)
 		{}
 
 		VermTreeIterator & operator=(const VOption & opt);
@@ -818,8 +818,8 @@ class ERMInterpreter : public CScriptingModule
 
 	std::string processERMString(std::string ermstring);
 
-	VERMInterpreter::VOption eval( VERMInterpreter::VOption line, VERMInterpreter::Environment * env = NULL );
-	VERMInterpreter::VOptionList evalEach( VERMInterpreter::VermTreeIterator list, VERMInterpreter::Environment * env = NULL ); 
+	VERMInterpreter::VOption eval( VERMInterpreter::VOption line, VERMInterpreter::Environment * env = nullptr );
+	VERMInterpreter::VOptionList evalEach( VERMInterpreter::VermTreeIterator list, VERMInterpreter::Environment * env = nullptr );
 
 public:
 	typedef std::map< int, std::vector<int> > TIDPattern;
@@ -839,13 +839,13 @@ public:
 	int getRealLine(const VERMInterpreter::LinePointer &lp);
 
 	//overload CScriptingModule
-	virtual void heroVisit(const CGHeroInstance *visitor, const CGObjectInstance *visitedObj, bool start) OVERRIDE;
-	virtual void init() OVERRIDE;//sets up environment etc.
-	virtual void executeUserCommand(const std::string &cmd) OVERRIDE;
-	virtual void giveInfoCB(CPrivilagedInfoCallback *cb) OVERRIDE;
-	virtual void giveActionCB(IGameEventRealizer *cb) OVERRIDE;
+	virtual void heroVisit(const CGHeroInstance *visitor, const CGObjectInstance *visitedObj, bool start) override;
+	virtual void init() override;//sets up environment etc.
+	virtual void executeUserCommand(const std::string &cmd) override;
+	virtual void giveInfoCB(CPrivilagedInfoCallback *cb) override;
+	virtual void giveActionCB(IGameEventRealizer *cb) override;
 
-	virtual void battleStart(const CCreatureSet *army1, const CCreatureSet *army2, int3 tile, const CGHeroInstance *hero1, const CGHeroInstance *hero2, bool side) OVERRIDE;
+	virtual void battleStart(const CCreatureSet *army1, const CCreatureSet *army2, int3 tile, const CGHeroInstance *hero1, const CGHeroInstance *hero2, bool side) override;
 
 	const CGObjectInstance *getObjFrom(int3 pos);
 	template <typename T>
diff --git a/scripting/erm/ERMParser.cpp b/scripting/erm/ERMParser.cpp
index 74d078881..f3a3e5768 100644
--- a/scripting/erm/ERMParser.cpp
+++ b/scripting/erm/ERMParser.cpp
@@ -1,10 +1,6 @@
 #include "StdInc.h"
 #include "ERMParser.h"
 
-//To make compilation with older boost versions possible
-//Don't know exact version - 1.46 works while 1.42 not
-#if BOOST_VERSION >= 104600
-
 /*
  * ERMParser.cpp, part of VCMI engine
  *
@@ -67,7 +63,7 @@ std::string CERMPreprocessor::retreiveCommandLine()
 		getline(line); //reading line
 
 
-		int dash = line.find_first_of('^');
+		size_t dash = line.find_first_of('^');
 		bool inTheMiddle = openedBraces || openedString;
 
 		if(!inTheMiddle)
@@ -547,10 +543,4 @@ void ERMParser::repairEncoding( char * str, int len ) const
 	for(int g=0; g<len; ++g)
 		if(str[g] & 0x80)
 			str[g] = '|';
-}
-#else
-
-ERMParser::ERMParser(std::string file){}
-std::vector<LineInfo> ERMParser::parseFile() {std::vector<LineInfo> dummy; return dummy;} //compile fix
-
-#endif
+}
\ No newline at end of file