diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23c5a01922..8ada2d2623 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,8 @@ if (NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
     endif()
 endif()
 
-set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/defaults
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
+                      ${CMAKE_SOURCE_DIR}/cmake/defaults
                       ${CMAKE_SOURCE_DIR}/cmake/modules
                       ${CMAKE_SOURCE_DIR}/cmake/macros)