diff --git a/development/cmake/modules/FindGNUWIN32.cmake b/development/cmake/modules/FindGNUWIN32.cmake
index 3fe83dbcd1..9a6fa1440d 100644
--- a/development/cmake/modules/FindGNUWIN32.cmake
+++ b/development/cmake/modules/FindGNUWIN32.cmake
@@ -1,6 +1,8 @@
 if (WIN32)
 
-file(TO_CMAKE_PATH "$ENV{PROGRAMFILES}" _progFiles)
+if(NOT GNUWIN32_DIR)
+	file(TO_CMAKE_PATH "$ENV{PROGRAMFILES}" _progFiles)
+endif(NOT GNUWIN32_DIR)
 
 find_file(GNUWIN32_DIR gnuwin32 win32libs 
    PATHS