diff --git a/indra/llwindow/CMakeLists.txt b/indra/llwindow/CMakeLists.txt
index 0743fd899f2795e5a07dea6c10a5f7c432c4bc52..726147e86611b3fdf1057dcf3f911a056bc38cb2 100644
--- a/indra/llwindow/CMakeLists.txt
+++ b/indra/llwindow/CMakeLists.txt
@@ -148,6 +148,11 @@ if (WINDOWS)
        comdlg32     # Common Dialogs for ChooseColor
        ole32
        )
+  set_source_files_properties(
+       llwindowwin32.cpp
+       PROPERTIES
+       COMPILE_FLAGS "/showIncludes"
+       )
 endif (WINDOWS)
 
 if (SOLARIS)