diff --git a/src/test/test-util.c b/src/test/test-util.c
index 10d8d210d5b..8ceb71f22a9 100644
--- a/src/test/test-util.c
+++ b/src/test/test-util.c
@@ -270,6 +270,9 @@ static void test_parse_pid(void) {
         r = parse_pid("0xFFFFFFFFFFFFFFFFF", &pid);
         assert_se(r == -ERANGE);
         assert_se(pid == 65);
+
+        r = parse_pid("junk", &pid);
+        assert_se(r == -EINVAL);
 }
 
 static void test_parse_uid(void) {