diff --git a/sys/netgraph/ng_sample.c b/sys/netgraph/ng_sample.c
--- a/sys/netgraph/ng_sample.c
+++ b/sys/netgraph/ng_sample.c
@@ -271,7 +271,7 @@
 			struct ngxxxstat *stats;
 
 			NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
-			if (!resp) {
+			if (resp == NULL) {
 				error = ENOMEM;
 				break;
 			}