diff --git a/transport/pipe/pipe.go b/transport/pipe/pipe.go
index 0c85ad64..6c70ba2c 100644
--- a/transport/pipe/pipe.go
+++ b/transport/pipe/pipe.go
@@ -57,7 +57,9 @@ func init() {
 		Name:    raySizeEnvKey,
 		AltName: platform.NormalizeEnvName(raySizeEnvKey),
 	}.GetValueAsInt(10)
-	if size > 0 {
+	if size == 0 {
+		defaultLimit = 2147483647
+	} else {
 		defaultLimit = int32(size) * 1024 * 1024
 	}
 }