diff --git a/proxy/http.go b/proxy/http.go
index 7e7668d7..b0dec31d 100644
--- a/proxy/http.go
+++ b/proxy/http.go
@@ -41,7 +41,9 @@ func (h *HTTP) DialContext(ctx context.Context, metadata *M.Metadata) (c net.Con
 	}
 	setKeepAlive(c)
 
-	defer safeConnClose(c, err)
+	defer func(c net.Conn) {
+		safeConnClose(c, err)
+	}(c)
 
 	err = h.shakeHand(metadata, c)
 	return
diff --git a/proxy/shadowsocks.go b/proxy/shadowsocks.go
index 4db7d88d..a64b2769 100644
--- a/proxy/shadowsocks.go
+++ b/proxy/shadowsocks.go
@@ -49,7 +49,9 @@ func (ss *Shadowsocks) DialContext(ctx context.Context, metadata *M.Metadata) (c
 	}
 	setKeepAlive(c)
 
-	defer safeConnClose(c, err)
+	defer func(c net.Conn) {
+		safeConnClose(c, err)
+	}(c)
 
 	switch ss.obfsMode {
 	case "tls":
diff --git a/proxy/socks4.go b/proxy/socks4.go
index 52c3ce5b..d8501172 100644
--- a/proxy/socks4.go
+++ b/proxy/socks4.go
@@ -36,7 +36,9 @@ func (ss *Socks4) DialContext(ctx context.Context, metadata *M.Metadata) (c net.
 	}
 	setKeepAlive(c)
 
-	defer safeConnClose(c, err)
+	defer func(c net.Conn) {
+		safeConnClose(c, err)
+	}(c)
 
 	err = socks4.ClientHandshake(c, metadata.DestinationAddress(), socks4.CmdConnect, ss.userID)
 	return
diff --git a/proxy/socks5.go b/proxy/socks5.go
index 64bf596e..bdc9b04c 100644
--- a/proxy/socks5.go
+++ b/proxy/socks5.go
@@ -49,7 +49,9 @@ func (ss *Socks5) DialContext(ctx context.Context, metadata *M.Metadata) (c net.
 	}
 	setKeepAlive(c)
 
-	defer safeConnClose(c, err)
+	defer func(c net.Conn) {
+		safeConnClose(c, err)
+	}(c)
 
 	var user *socks5.User
 	if ss.user != "" {