diff --git a/stubs.cmake b/stubs.cmake
index 9db2ec914..e319b936a 100644
--- a/stubs.cmake
+++ b/stubs.cmake
@@ -97,7 +97,7 @@ function(GENERATE_STUBS module_path module_name module_install_dir)
   endif($ENV{PYTHONPATH})
 
   if(WIN32)
-    if($ENV{PYTHONPATH})
+    if($ENV{PATH})
       set(WINDOWS_PATH ${module_path};$ENV{PATH})
     else()
       set(WINDOWS_PATH ${module_path})