diff --git a/tests/socket-test.c b/tests/socket-test.c
index 2e336fdc..bb034f43 100644
--- a/tests/socket-test.c
+++ b/tests/socket-test.c
@@ -47,8 +47,7 @@ static const char *
 require_xdg_runtime_dir(void)
 {
 	char *val = getenv("XDG_RUNTIME_DIR");
-	if (!val)
-		assert(0 && "set $XDG_RUNTIME_DIR to run this test");
+	assert(val && "set $XDG_RUNTIME_DIR to run this test");
 
 	return val;
 }