diff --git a/test/typecheck/main.go b/test/typecheck/main.go
index eb213293cfd..9cb1c17a9e1 100644
--- a/test/typecheck/main.go
+++ b/test/typecheck/main.go
@@ -241,10 +241,10 @@ func dedup(errors []packages.Error) []string {
 
 var outMu sync.Mutex
 
-func serialFprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+func serialFprintf(w io.Writer, format string, a ...interface{}) {
 	outMu.Lock()
 	defer outMu.Unlock()
-	return fmt.Fprintf(w, format, a...)
+	_, _ = fmt.Fprintf(w, format, a...)
 }
 
 func main() {