diff --git a/CMakeLists.txt b/CMakeLists.txt
index 491e58f7f8..075a6a74e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -480,7 +480,7 @@ if(NOT GROUP_CODE)
 endif()
 
 # lyx's source files
-set(LYX_CPP_FILES *.cpp)
+set(LYX_CPP_FILES [a-zA-Z]*.cpp)
 set(LYX_HPP_FILES *.h)
 set(LYX_MOC_FILES moc_*.cpp)