diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,10 +22,7 @@
 string(REPLACE "%s" ${COPYRIGHT_HOLDERS_SUBSTITUTION} COPYRIGHT_HOLDERS_FINAL ${COPYRIGHT_HOLDERS})
 
 # Add path for custom modules
-set(CMAKE_MODULE_PATH
-	${CMAKE_MODULE_PATH}
-	${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules
-)
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)
 
 # Make contrib script accessible.
 set(CONTRIB_PATH ${CMAKE_CURRENT_SOURCE_DIR}/contrib)