diff --git a/WINGs/WINGs/WUtil.h b/WINGs/WINGs/WUtil.h
index ec691f43..246ef2d1 100644
--- a/WINGs/WINGs/WUtil.h
+++ b/WINGs/WINGs/WUtil.h
@@ -347,7 +347,7 @@ void WHandleEvents(void);
 /* ---[ WINGs/hashtable.c ]----------------------------------------------- */
 
 
-WMHashTable* WMCreateHashTable(WMHashTableCallbacks callbacks);
+WMHashTable* WMCreateHashTable(const WMHashTableCallbacks callbacks);
 
 void WMFreeHashTable(WMHashTable *table);
 
diff --git a/WINGs/hashtable.c b/WINGs/hashtable.c
index d8e53a27..c4c82144 100644
--- a/WINGs/hashtable.c
+++ b/WINGs/hashtable.c
@@ -90,7 +90,7 @@ static void rebuildTable(WMHashTable * table)
 	wfree(oldArray);
 }
 
-WMHashTable *WMCreateHashTable(WMHashTableCallbacks callbacks)
+WMHashTable *WMCreateHashTable(const WMHashTableCallbacks callbacks)
 {
 	HashTable *table;