diff --git a/lib/expat/CMakeLists.txt b/lib/expat/CMakeLists.txt
index 540266377..a23f16609 100644
--- a/lib/expat/CMakeLists.txt
+++ b/lib/expat/CMakeLists.txt
@@ -7,10 +7,8 @@ file(GLOB SOURCE
     "*.h"
 )
 
-# add headers to MSVC project files:
-if (WIN32)
-	file(GLOB HEADERS "*.h")
-	set(SOURCE ${SOURCE} ${HEADERS})
+# Set files to go to a "Sources" folder in MSVC project files:
+if (MSVC)
 	source_group("Sources" FILES ${SOURCE})
 endif()