diff --git a/src/group.h b/src/group.h
--- a/src/group.h
+++ b/src/group.h
@@ -51,7 +51,7 @@ static inline bool IsAllGroupID(GroupID 
 /**
  * Get the current size of the GroupPool
  */
-static inline uint GetGroupArraySize(void)
+static inline uint GetGroupArraySize()
 {
 	const Group *g;
 	uint num = 0;