diff --git a/lib/HeroBonus.cpp b/lib/HeroBonus.cpp
index 6e7de43f9..1821a0efd 100644
--- a/lib/HeroBonus.cpp
+++ b/lib/HeroBonus.cpp
@@ -178,6 +178,13 @@ bool CAddInfo::operator!=(si32 value) const
 	return !operator==(value);
 }
 
+si32 & CAddInfo::operator[](size_type pos)
+{
+	if (pos <= size())
+		resize(pos + 1, CAddInfo::NONE);
+	return vector::operator[](pos);
+}
+
 si32 CAddInfo::operator[](size_type pos) const
 {
 	return pos < size() ? vector::operator[](pos) : CAddInfo::NONE;
diff --git a/lib/HeroBonus.h b/lib/HeroBonus.h
index 5eb547189..6dbf89c20 100644
--- a/lib/HeroBonus.h
+++ b/lib/HeroBonus.h
@@ -90,7 +90,7 @@ private:
 class DLL_LINKAGE CAddInfo : public std::vector<si32>
 {
 public:
-	static const si32 NONE = -1;
+	enum { NONE = -1 };
 
 	CAddInfo();
 	CAddInfo(si32 value);
@@ -98,7 +98,7 @@ public:
 	bool operator==(si32 value) const;
 	bool operator!=(si32 value) const;
 
-	using std::vector<si32>::operator[];
+	si32 & operator[](size_type pos);
 	si32 operator[](size_type pos) const;
 
 	std::string toString() const;