diff --git a/source3/rpc_server/mdssvc/dalloc.c b/source3/rpc_server/mdssvc/dalloc.c
index 23193fee70a..2e13203c4c6 100644
--- a/source3/rpc_server/mdssvc/dalloc.c
+++ b/source3/rpc_server/mdssvc/dalloc.c
@@ -275,7 +275,7 @@ char *dalloc_dump(DALLOC_CTX *dd, int nestinglevel)
 	}
 
 	logstring = talloc_asprintf(dd,
-				    "%s%s(#%lu): {\n",
+				    "%s%s(#%zu): {\n",
 				    tab_string1,
 				    talloc_get_name(dd),
 				    dalloc_size(dd));