diff --git a/runprebuild.bat b/runprebuild.bat
index 68830aabe7..e5ec6e0287 100755
--- a/runprebuild.bat
+++ b/runprebuild.bat
@@ -57,7 +57,7 @@ goto :done
 rem To compile in debug mode
     @echo %ValueValue% opensim.sln > compile.bat
 rem To compile in release mode comment line (add rem to start) above and uncomment next (remove rem)
-rem @echo %ValueValue% /P:Config=Release opensim.sln > compile.bat
+rem    @echo %ValueValue% /p:Configuration=Release opensim.sln > compile.bat
 :done
 if exist "bin\addin-db-002" (
 	del /F/Q/S bin\addin-db-002 > NUL
diff --git a/runprebuild19.bat b/runprebuild19.bat
index 9933ce762c..b4ebfa4254 100644
--- a/runprebuild19.bat
+++ b/runprebuild19.bat
@@ -31,7 +31,7 @@ goto :done
 rem To compile in debug mode
     @echo %ValueValue% opensim.sln > compile.bat
 rem To compile in release mode comment line (add rem to start) above and uncomment next (remove rem)
-rem @echo %ValueValue% /P:Config=Release opensim.sln > compile.bat
+rem    @echo %ValueValue% /p:Configuration=Release opensim.sln > compile.bat
 :done
 if exist "bin\addin-db-002" (
 	del /F/Q/S bin\addin-db-002 > NUL