diff --git a/sys/netgraph7/deflate/ng_deflate.c b/sys/netgraph7/deflate/ng_deflate.c
--- a/sys/netgraph7/deflate/ng_deflate.c
+++ b/sys/netgraph7/deflate/ng_deflate.c
@@ -424,7 +424,7 @@
 z_alloc(void *notused, u_int items, u_int size)
 {
 
-	return (kmalloc(items * size, M_NETGRAPH_DEFLATE, M_WAITOK | M_NULLOK));
+	return (kmalloc(items * size, M_NETGRAPH_DEFLATE, M_WAITOK | M_NULLOK | M_ZERO));
 }
 
 static void