diff --git a/lib/HeroBonus.cpp b/lib/HeroBonus.cpp
index 1b24804ed..081d874f7 100644
--- a/lib/HeroBonus.cpp
+++ b/lib/HeroBonus.cpp
@@ -663,7 +663,7 @@ int IBonusBearer::valOfBonuses(Bonus::BonusType type, int subtype) const
 	//This part is performance-critical
 
 	char cachingStr[20] = {};
-	sprintf(cachingStr, "type_%ds_%d", (int)type, subtype);
+	std::sprintf(cachingStr, "type_%ds_%d", (int)type, subtype);
 
 	CSelector s = Selector::type()(type);
 	if(subtype != -1)
@@ -693,7 +693,7 @@ bool IBonusBearer::hasBonusOfType(Bonus::BonusType type, int subtype) const
 {
 	//This part is performance-ciritcal
 	char cachingStr[20] = {};
-	sprintf(cachingStr, "type_%ds_%d", (int)type, subtype);
+	std::sprintf(cachingStr, "type_%ds_%d", (int)type, subtype);
 
 	CSelector s = Selector::type()(type);
 	if(subtype != -1)
@@ -975,7 +975,7 @@ void CBonusSystemNode::getAllBonusesRec(BonusList &out) const
 	}
 	bonuses.getAllBonuses(beforeUpdate);
 
-	for(auto & b : beforeUpdate)
+	for(const auto & b : beforeUpdate)
 	{
 		auto updated = b->updater 
 			? getUpdatedBonus(b, b->updater) 
diff --git a/lib/int3.h b/lib/int3.h
index 0894892fe..d8861e314 100644
--- a/lib/int3.h
+++ b/lib/int3.h
@@ -160,7 +160,7 @@ public:
 	{
 		//Performance is important here
 		char str[16] = {};
-		sprintf(str, "(%d %d %d)", x, y, z);
+		std::sprintf(str, "(%d %d %d)", x, y, z);
 
 		return std::string(str);
 	}