diff --git a/build.bat b/build.bat
index 7c388a48..a3f67d7b 100644
--- a/build.bat
+++ b/build.bat
@@ -1,7 +1,8 @@
 @ECHO off
 SETLOCAL ENABLEDELAYEDEXPANSION
 
-IF "%Platform%" == "X64" (
+FOR /F %%i in ('powershell -c "\"%Platform%\".toLower()"') DO SET PLATFORM=%%i
+IF "%PLATFORM%" == "x64" (
     SET MSBUILDPLATFORM=x64
     SET BITS=64
 ) ELSE (
diff --git a/prepare_r2.bat b/prepare_r2.bat
index 137f5091..626dbb70 100644
--- a/prepare_r2.bat
+++ b/prepare_r2.bat
@@ -1,7 +1,8 @@
 @ECHO OFF
 SETLOCAL ENABLEDELAYEDEXPANSION
 
-IF "%Platform%" == "X64" (
+FOR /F %%i in ('powershell -c "\"%Platform%\".toLower()"') DO SET PLATFORM=%%i
+IF "%PLATFORM%" == "x64" (
     SET BITS=64
 ) ELSE (
     SET BITS=32