diff --git a/Telegram/gyp/refresh.bat b/Telegram/gyp/refresh.bat
index be6a96944e..77aa7a2cba 100644
--- a/Telegram/gyp/refresh.bat
+++ b/Telegram/gyp/refresh.bat
@@ -1,5 +1,6 @@
 @echo OFF
 
+setlocal enabledelayedexpansion
 set "FullScriptPath=%~dp0"
 
 python %FullScriptPath%generate.py %1 %2 %3 %4 %5 %6