diff --git a/src/systemctl/systemctl-show.c b/src/systemctl/systemctl-show.c
index 37c898f313..0985a452ec 100644
--- a/src/systemctl/systemctl-show.c
+++ b/src/systemctl/systemctl-show.c
@@ -2142,7 +2142,7 @@ int show(int argc, char *argv[], void *userdata) {
 
         show_mode = systemctl_show_mode_from_string(argv[0]);
         if (show_mode < 0)
-                return log_error_errno(show_mode, "Invalid argument.");
+                return log_error_errno(show_mode, "Invalid argument '%s'.", argv[0]);
 
         if (show_mode == SYSTEMCTL_SHOW_HELP && argc <= 1)
                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),