diff --git a/src/test/test-mountpoint-util.c b/src/test/test-mountpoint-util.c
index 6f9e68f4d9..6daab022aa 100644
--- a/src/test/test-mountpoint-util.c
+++ b/src/test/test-mountpoint-util.c
@@ -20,7 +20,7 @@
 static void test_mount_propagation_flags_one(const char *name, int ret, unsigned long expected) {
         unsigned long flags;
 
-        log_info("/* %s(%s) */", __func__, name);
+        log_info("/* %s(%s) */", __func__, strnull(name));
 
         assert_se(mount_propagation_flags_from_string(name, &flags) == ret);