diff --git a/protoc-gen-go/golden_test.go b/protoc-gen-go/golden_test.go
index 30d2799..2630de6 100644
--- a/protoc-gen-go/golden_test.go
+++ b/protoc-gen-go/golden_test.go
@@ -39,7 +39,7 @@
 
 	// Find all the proto files we need to compile. We assume that each directory
 	// contains the files for a single package.
-	supportTypeAliases := hasReleaseTag("1.9")
+	supportTypeAliases := hasReleaseTag("go1.9")
 	packages := map[string][]string{}
 	err = filepath.Walk("testdata", func(path string, info os.FileInfo, err error) error {
 		if filepath.Base(path) == "import_public" && !supportTypeAliases {