diff --git a/CMakeLists.txt b/CMakeLists.txt
index f4acd612..aee50230 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,9 +8,13 @@ IF(CATKIN_TOPLEVEL OR CATKIN_BUILD_BINARY_PACKAGE OR CATKIN_SKIP_TESTING OR CATK
   SET(CATKIN_BUILD TRUE)
 ELSE()
   # Detect if it is called by colcon (ros2)
-  string(FIND ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR} POS)
-  IF(${POS} EQUAL -1)
-     SET(COLCON_BUILD TRUE)
+  IF(DEFINED AMENT_PREFIX_PATH) # buildfarm
+    SET(COLCON_BUILD TRUE)
+  ELSE() # colcon local build in ros2_ws
+    string(FIND ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR} POS)
+    IF(${POS} EQUAL -1)
+      SET(COLCON_BUILD TRUE)
+    ENDIF()
   ENDIF()
 ENDIF()