diff --git a/src/options_test.go b/src/options_test.go
index 4a859b0..5def73d 100644
--- a/src/options_test.go
+++ b/src/options_test.go
@@ -454,7 +454,6 @@ func TestValidateSign(t *testing.T) {
 		{"> ", true},
 		{"아", true},
 		{"😀", true},
-		{"", false},
 		{">>>", false},
 	}