diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index fb7017e..3dd2d2a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -9,7 +9,7 @@ find_package( Boost REQUIRED COMPONENTS regex )
 include(compiler)
 
 include_directories(
-    ${CMAKE_SOURCE_DIR}/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/../include
 )
 
 set(SRC_LIST