diff --git a/varfmt/fmt_test.go b/varfmt/fmt_test.go
index ab5341b..c88befe 100644
--- a/varfmt/fmt_test.go
+++ b/varfmt/fmt_test.go
@@ -49,6 +49,11 @@ func TestFormat(t *testing.T) {
 			args:   []interface{}{0, 1, "World"},
 			result: "Hello, World",
 		},
+		{
+			format: "He{2}o",
+			args:   []interface{}{0, 1, "ll"},
+			result: "Hello",
+		},
 		{
 			format: "{10}",
 			args:   s[:11],