diff --git a/cmake/HDF5Config.cmake b/cmake/HDF5Config.cmake
index e58a3cae62..3be63d7239 100644
--- a/cmake/HDF5Config.cmake
+++ b/cmake/HDF5Config.cmake
@@ -1,5 +1,5 @@
 # To avoid cyclic calls to this file
-list(REMOVE_ITEM CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR})
+list(REMOVE_ITEM CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR})
 
 if("${HDF5_INCLUDE_DIR}" STREQUAL "")
     message(STATUS "No HDF5 include directory specified")
@@ -88,4 +88,4 @@ if(NOT HDF5_INCLUDE_DIR OR NOT HDF5_LIBRARY_DIR)
 endif()
 
 # Restore module path.
-list(PREPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR})
+list(PREPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR})