diff --git a/reactos/CMakeLists.txt b/reactos/CMakeLists.txt
index 5d09f92f1fa..68143311105 100644
--- a/reactos/CMakeLists.txt
+++ b/reactos/CMakeLists.txt
@@ -134,7 +134,7 @@ else()
         add_definitions(-D_WINKD_=1)
     endif()
 
-    if(CMAKE_VERSION STREQUAL "2.8.12.1-ReactOS")
+    if((NOT DEFINED PCH) AND (CMAKE_VERSION STREQUAL "2.8.12.1-ReactOS"))
         set(PCH 1)
     else()
         set(PCH 0)