diff --git a/pkg/codegen/utils_test.go b/pkg/codegen/utils_test.go
index af71438473..0666fc9909 100644
--- a/pkg/codegen/utils_test.go
+++ b/pkg/codegen/utils_test.go
@@ -604,6 +604,7 @@ func TestSchemaNameToTypeName(t *testing.T) {
 		"=3":           "Equal3",
 		"#Tag":         "HashTag",
 		".com":         "DotCom",
+		"_1":           "Underscore1",
 		">=":           "GreaterThanEqual",
 		"<=":           "LessThanEqual",
 		"<":            "LessThan",