diff --git a/src/cmd/go/internal/modfetch/coderepo_test.go b/src/cmd/go/internal/modfetch/coderepo_test.go
index 28c5e67a28d985..4364fef6d1b825 100644
--- a/src/cmd/go/internal/modfetch/coderepo_test.go
+++ b/src/cmd/go/internal/modfetch/coderepo_test.go
@@ -648,7 +648,7 @@ var codeRepoVersionsTests = []struct {
 	{
 		vcs:      "git",
 		path:     "gopkg.in/russross/blackfriday.v2",
-		versions: []string{"v2.0.0", "v2.0.1"},
+		versions: []string{"v2.0.0", "v2.0.1", "v2.1.0-pre.1"},
 	},
 	{
 		vcs:      "git",