diff --git a/mpir.net/build.vc/check_config.bat b/mpir.net/build.vc/check_config.bat
index e3640bcb..09dad8d5 100644
--- a/mpir.net/build.vc/check_config.bat
+++ b/mpir.net/build.vc/check_config.bat
@@ -1,7 +1,7 @@
 @echo off
 rem %1 = platform
 rem %2 = configuration
-rem %3 - msvc version
+rem %3 - last two digits of Visul Studio version (e.g. 17)
 
 rem output_params.bat contains:
 rem (set ldir=architecture)   
@@ -10,7 +10,8 @@ rem (set plat=x64)
 rem (set conf=Release) 
 
 call :clrerr
-if exist ..\..\build.vc\output_params.bat (call ..\..\build.vc\output_params.bat) else (call :seterr & echo ERROR: 'output_params.bat' not found & exit /b %errorlevel%)
+if exist ..\..\msvc\output_params.bat (call ..\..\msvc\output_params.bat) else (call :seterr & echo ERROR: 'output_params.bat' not found & exit /b %errorlevel%)
+if /i "%libr%" NEQ "lib" (call :seterr & echo ERROR: MPIR.Net requires a static library build of MPIR & exit /b %errorlevel%)
 
 if /i "%1" EQU "%plat%" if /i "%2" EQU "%conf%" (exit /b 0)