diff --git a/build/vc10-x86_64/build-all.bat b/build/vc10-x86_64/build-all.bat
index 928d4812..ff315ecd 100644
--- a/build/vc10-x86_64/build-all.bat
+++ b/build/vc10-x86_64/build-all.bat
@@ -1,5 +1,5 @@
 @echo off
-if "%VS120COMNTOOLS%" == "" (
+if "%VS100COMNTOOLS%" == "" (
   msg "%username%" "Visual Studio 12 not detected"
   exit 1
 )
diff --git a/build/vc12-x86_64/build-all.bat b/build/vc12-x86_64/build-all.bat
index 928d4812..a7f2c24f 100644
--- a/build/vc12-x86_64/build-all.bat
+++ b/build/vc12-x86_64/build-all.bat
@@ -7,7 +7,7 @@ if not exist rk_mpp.sln (
   call make-solutions.bat
 )
 if exist rk_mpp.sln (
-  call "%VS100COMNTOOLS%\..\..\VC\vcvarsall.bat"
+  call "%VS120COMNTOOLS%\..\..\VC\vcvarsall.bat"
   rem MSBuild /property:Configuration="Release" rk_mpp.sln
   MSBuild /property:Configuration="Debug" rk_mpp.sln
   rem MSBuild /property:Configuration="RelWithDebInfo" rk_mpp.sln