diff --git a/server/core/dcb.c b/server/core/dcb.c
index 1dfde0b58..d0d93aff8 100644
--- a/server/core/dcb.c
+++ b/server/core/dcb.c
@@ -1771,7 +1771,7 @@ int		rval = 1;
  * @return		Non-zero (true) if the callback was removed
  */
 int
-dcb_remove_callback(DCB *dcb, DCB_REASON reason, int (*callback)(struct dcb *, DCB_REASON), void *userdata)
+dcb_remove_callback(DCB *dcb, DCB_REASON reason, int (*callback)(struct dcb *, DCB_REASON, void *), void *userdata)
 {
 DCB_CALLBACK	*cb, *pcb = NULL;
 int		rval = 0;
diff --git a/server/include/dcb.h b/server/include/dcb.h
index 88964fc31..956bb3ef6 100644
--- a/server/include/dcb.h
+++ b/server/include/dcb.h
@@ -289,7 +289,7 @@ void		dcb_hashtable_stats(DCB *, void *);	/**< Print statisitics */
 void            dcb_add_to_zombieslist(DCB* dcb);
 int		dcb_add_callback(DCB *, DCB_REASON, int	(*)(struct dcb *, DCB_REASON, void *),
 			 void *);
-int		dcb_remove_callback(DCB *, DCB_REASON, int	(*)(struct dcb *, DCB_REASON),
+int		dcb_remove_callback(DCB *, DCB_REASON, int	(*)(struct dcb *, DCB_REASON, void *),
 			 void *);
 int		dcb_isvalid(DCB *);			/* Check the DCB is in the linked list */