diff --git a/CMakeLists.txt b/CMakeLists.txt
index 68f50ff..50a9226 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,8 @@ SET(LIBS)
 IF(USE_LIBUBOX)
   ADD_DEFINITIONS(-DUSE_LIBUBOX)
   SET(LIBS ubox)
+  FIND_PATH(ubox_include_dir libubox/utils.h)
+  INCLUDE_DIRECTORIES(${ubox_include_dir})
 ELSE()
   SET(SOURCES ${SOURCES} base64.c)
 ENDIF()