diff --git a/cmd/stringer/endtoend_test.go b/cmd/stringer/endtoend_test.go
index c6a2b000..f8285867 100644
--- a/cmd/stringer/endtoend_test.go
+++ b/cmd/stringer/endtoend_test.go
@@ -175,5 +175,6 @@ func runInDir(dir, name string, arg ...string) error {
 	cmd.Dir = dir
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
+	cmd.Env = append(os.Environ(), "GO111MODULE=auto")
 	return cmd.Run()
 }