diff --git a/src/game/ReputationMgr.h b/src/game/ReputationMgr.h
index d63c518eb8..494f675d20 100644
--- a/src/game/ReputationMgr.h
+++ b/src/game/ReputationMgr.h
@@ -24,6 +24,7 @@
 #include "Language.h"
 #include "DBCStructure.h"
 #include <map>
+#include <math.h>
 
 static uint32 ReputationRankStrIndex[MAX_REPUTATION_RANK] =
 {