diff --git a/toonz/sources/CMakeLists.txt b/toonz/sources/CMakeLists.txt
index b8cac509..97b0e38b 100644
--- a/toonz/sources/CMakeLists.txt
+++ b/toonz/sources/CMakeLists.txt
@@ -3,7 +3,7 @@ project(OpenToonz)
 
 get_filename_component(SDKROOT ../../thirdparty/ ABSOLUTE)
 message("SDK Root:" ${SDKROOT})
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "../cmake")
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/../cmake")
 if(APPLE)
     set(THIRDPARTY_LIBS_HINTS "/usr/local/Cellar/" "/opt/include" ${SDKROOT})
 elseif(WIN32)