diff --git a/go/tools/builders/env.go b/go/tools/builders/env.go
index 5faacee0ce..7c91c900f0 100644
--- a/go/tools/builders/env.go
+++ b/go/tools/builders/env.go
@@ -137,7 +137,7 @@ func (e *env) runCommand(args []string) error {
 	cmd.Stdout = buf
 	cmd.Stderr = buf
 	err := runAndLogCommand(cmd, e.verbose)
-	fmt.Fprint(os.Stderr, relativizePaths(buf.Bytes()))
+	os.Stderr.Write(relativizePaths(buf.Bytes()))
 	return err
 }