diff --git a/src/cmd/gc/closure.c b/src/cmd/gc/closure.c
index 9aeac8aba4..35b6d4b1b4 100644
--- a/src/cmd/gc/closure.c
+++ b/src/cmd/gc/closure.c
@@ -140,8 +140,8 @@ closurename(Node *n)
 	if(n->sym != S)
 		return n->sym;
 	gen = 0;
-	outer = NULL;
-	prefix = NULL;
+	outer = nil;
+	prefix = nil;
 	if(n->outerfunc == N) {
 		// Global closure.
 		outer = "glob";