diff --git a/src/udev/udev-builtin.c b/src/udev/udev-builtin.c
index 3a61be10ca..48ce295a46 100644
--- a/src/udev/udev-builtin.c
+++ b/src/udev/udev-builtin.c
@@ -139,7 +139,7 @@ int udev_builtin_add_property(sd_device *dev, bool test, const char *key, const
                                               key, val ? "=" : "", strempty(val));
 
         if (test)
-                printf("%s=%s\n", key, val);
+                printf("%s=%s\n", key, strempty(val));
 
         return 0;
 }