diff --git a/CMakeLists.txt b/CMakeLists.txt
index 213f557213..29cb1af795 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ SET(CPACK_PACKAGE_VERSION_MAJOR "2")
 SET(CPACK_PACKAGE_VERSION_MINOR "1")
 SET(CPACK_PACKAGE_VERSION_PATCH "0-SNAPSHOT")
 SET(ORC_VERSION "${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH}")
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake_modules")
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules")
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON) # For clang-tidy.
 
 option (BUILD_JAVA