diff --git a/src/lib/commands/show.c b/src/lib/commands/show.c
index 78a42a2c..e26ecf1b 100644
--- a/src/lib/commands/show.c
+++ b/src/lib/commands/show.c
@@ -122,5 +122,7 @@ show(void)
 	(*cfunc) (tlev);
     else if (*p == 'S' || *p == 's')
 	(*sfunc) (tlev);
+    else
+	return RET_SYN;
     return RET_OK;
 }