diff --git a/demo/CMakeLists.txt b/demo/CMakeLists.txt
--- a/demo/CMakeLists.txt
+++ b/demo/CMakeLists.txt
@@ -1,9 +1,9 @@
 INCLUDE_DIRECTORIES(
-  ${CMAKE_SOURCE_DIR}
-  ${CMAKE_BINARY_DIR}
+  ${PROJECT_SOURCE_DIR}
+  ${PROJECT_BINARY_DIR}
 )
 
-LINK_DIRECTORIES(${CMAKE_BINARY_DIR}/lemon)
+LINK_DIRECTORIES(${PROJECT_BINARY_DIR}/lemon)
 
 SET(DEMOS
   arg_parser_demo