diff --git a/win/run-cmake.bat b/win/run-cmake.bat
index aa837c3a73..a824abb87b 100755
--- a/win/run-cmake.bat
+++ b/win/run-cmake.bat
@@ -73,7 +73,7 @@ if not (%1)==() (
 )
 
 pushd ..
-set CMAKE_INSTALL_PREFIX=%CD%\installed-%GEN_SHORTHAND%
+set CMAKE_INSTALL_PREFIX=%CD%\_installed-%GEN_SHORTHAND%
 popd
 
 IF NOT EXIST ..\%BUILD_DIR%. mkdir ..\%BUILD_DIR%