diff --git a/process/process_posix.go b/process/process_posix.go
index 36c6a47..7bd9b05 100644
--- a/process/process_posix.go
+++ b/process/process_posix.go
@@ -122,7 +122,7 @@ func PidExistsWithContext(ctx context.Context, pid int32) (bool, error) {
 	if err == nil {
 		return true, nil
 	}
-	if err.Error() == "os: process already finished" {
+	if errors.Is(err, os.ErrProcessDone) {
 		return false, nil
 	}
 	var errno syscall.Errno