diff --git a/media/baseset/CMakeLists.txt b/media/baseset/CMakeLists.txt
--- a/media/baseset/CMakeLists.txt
+++ b/media/baseset/CMakeLists.txt
@@ -67,7 +67,7 @@ foreach(BASESET_OTHER_SOURCE_FILE IN LIS
     get_filename_component(BASESET_OTHER_SOURCE_FILE_NAME "${BASESET_OTHER_SOURCE_FILE}" NAME)
     set(BASESET_OTHER_BINARY_FILE "${CMAKE_BINARY_DIR}/baseset/${BASESET_OTHER_SOURCE_FILE_NAME}")
 
-    add_custom_command(OUTPUT ${BASESET_OTHER_BINARY_FILE}
+    add_custom_command_timestamp(OUTPUT ${BASESET_OTHER_BINARY_FILE}
             COMMAND ${CMAKE_COMMAND} -E copy
                     ${BASESET_OTHER_SOURCE_FILE}
                     ${BASESET_OTHER_BINARY_FILE}