diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b61ea39..285305d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@ configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib.pc.cmakein
 		${CMAKE_CURRENT_BINARY_DIR}/zlib.pc @ONLY)
 configure_file(	${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
 		${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
-include_directories(${CMAKE_CURRENT_BINARY_DIR})
+include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_SOURCE_DIR})
 
 
 #============================================================================