1 files changed, 7 insertions, 6 deletions
diff --git a/tun_darwin.go b/tun_darwin.go
index b212e57..ac8bffd 100644
--- a/tun_darwin.go
+++ b/tun_darwin.go
@@ -125,12 +125,6 @@ func CreateTUNFromFile(file *os.File) (TUNDevice, error) {
 		return nil, err
 	}
 
-	// set default MTU
-	err = tun.setMTU(DefaultMTU)
-	if err != nil {
-		return nil, err
-	}
-
 	tun.rwcancel, err = rwcancel.NewRWCancel(int(file.Fd()))
 	if err != nil {
 		return nil, err
@@ -174,6 +168,13 @@ func CreateTUNFromFile(file *os.File) (TUNDevice, error) {
 		}
 	}(tun)
 
+	// set default MTU
+	err = tun.setMTU(DefaultMTU)
+	if err != nil {
+		tun.Close()
+		return nil, err
+	}
+
 	return tun, nil
 }