diff --git a/gossipd/test/run-bench-find_route.c b/gossipd/test/run-bench-find_route.c
index 02164cdf9..ad702243d 100644
--- a/gossipd/test/run-bench-find_route.c
+++ b/gossipd/test/run-bench-find_route.c
@@ -162,7 +162,7 @@ static struct pubkey nodeid(size_t n)
 	struct secret s;
 
 	memset(&s, 0xFF, sizeof(s));
-	memcpy(&s, &n, sizeof(s) / sizeof(n));
+	memcpy(&s, &n, sizeof(n));
 	pubkey_from_secret(&s, &id);
 	return id;
 }