diff --git a/CMakeLists.txt b/CMakeLists.txt
index bd69242..56261de 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,8 @@ else()
     set(PDF2HTMLEX_LIBS ${PDF2HTMLEX_LIBS} ${PYTHON_LIBRARIES})
 endif()
 
-find_path(FF_CONFIG_INCLUDE_PATH config.h PATHS ${FONTFORGE_INCLUDE_DIRS})
+find_path(FF_CONFIG_INCLUDE_PATH config.h PATHS
+  ${FONTFORGE_INCLUDE_DIRS} NO_DEFAULT_PATH)
 if(FF_CONFIG_INCLUDE_PATH)
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -include ${FF_CONFIG_INCLUDE_PATH}/config.h")
 message("Found config.h: ${FF_CONFIG_INCLUDE_PATH}/config.h")