diff --git a/lib/include/CMakeLists.txt b/lib/include/CMakeLists.txt
index 21794ee..bd4ce25 100644
--- a/lib/include/CMakeLists.txt
+++ b/lib/include/CMakeLists.txt
@@ -9,7 +9,7 @@ target_sources(${PROJECT_NAME}
 
 target_include_directories(${PROJECT_NAME}
   PUBLIC
-  "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/lib/include>"
+  "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
   "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>"
   "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")