diff --git a/CMakeLists.txt b/CMakeLists.txt
index 849912bd..e5b2b80f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ if(NOT "${CMAKE_CXX_STANDARD}")
 endif()
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
-set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
+list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
 option(BUILD_DOC "Build documentation" OFF)