diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 815f99403..2720c9aad 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -40,6 +40,7 @@ ${CMake_BINARY_DIR}/Source/cmConfigure.h )
 
 # add the include path to find the .h 
 INCLUDE_DIRECTORIES(${CMake_BINARY_DIR}/Source)
+INCLUDE_DIRECTORIES(${CMake_SOURCE_DIR}/Source)
 
 # let cmake know it is supposed to use it
 ADD_DEFINITIONS(-DCMAKE_BUILD_WITH_CMAKE)