diff --git a/cmake/app/boilerplate.cmake b/cmake/app/boilerplate.cmake
index 67ac778010f..4f35b9bb260 100644
--- a/cmake/app/boilerplate.cmake
+++ b/cmake/app/boilerplate.cmake
@@ -464,10 +464,6 @@ elseif(CACHED_CONF_FILE)
 elseif(DEFINED ENV{CONF_FILE})
   set(CONF_FILE $ENV{CONF_FILE})
 
-elseif(COMMAND set_conf_file)
-  message(WARNING "'set_conf_file' is deprecated, it will be removed in a future release.")
-  set_conf_file()
-
 elseif(EXISTS   ${APPLICATION_SOURCE_DIR}/prj_${BOARD}.conf)
   set(CONF_FILE ${APPLICATION_SOURCE_DIR}/prj_${BOARD}.conf)