diff --git a/development/cmake/CMakeLists.txt b/development/cmake/CMakeLists.txt
index ba8f746e1c..5477d69129 100644
--- a/development/cmake/CMakeLists.txt
+++ b/development/cmake/CMakeLists.txt
@@ -281,7 +281,7 @@ if(NOT disable-pch)
 	message(STATUS "-----")
 	configure_file(${CMAKE_SOURCE_DIR}/pcheaders.h ${CMAKE_BINARY_DIR}/pcheaders.h)
 	configure_file(${CMAKE_SOURCE_DIR}/config.cpp.cmake ${CMAKE_BINARY_DIR}/config_pch.cpp)
-
+	add_definitions(-DLYX_ENABLE_PCH)
 
 	if(MSVC AND NOT MERGE_FILES)
 		macro(lyx_add_msvc_pch name_)
@@ -301,7 +301,7 @@ if(NOT disable-pch)
 		macro(lyx_add_msvc_pch name_)
 		endmacro()
 		macro(lyx_add_gcc_pch name_)
-			add_definitions(-DLYX_ENABLE_PCH -DLYX_PCH_STL -DLYX_PCH_BOOST -DLYX_PCH_QT4)
+			add_definitions(-DLYX_PCH_STL -DLYX_PCH_BOOST -DLYX_PCH_QT4)
 			ADD_PRECOMPILED_HEADER(${name_} ${CMAKE_BINARY_DIR}/config_pch.cpp ${CMAKE_BINARY_DIR}/config.h.gch)
 		endmacro()
 	endif()