diff --git a/src/server/game/Conditions/ConditionMgr.h b/src/server/game/Conditions/ConditionMgr.h
index 6f941217572..98bc1775e0d 100644
--- a/src/server/game/Conditions/ConditionMgr.h
+++ b/src/server/game/Conditions/ConditionMgr.h
@@ -23,6 +23,7 @@
 #include "Errors.h"
 #include <list>
 #include <map>
+#include <string>
 
 class Player;
 class Unit;