diff --git a/cmake/Msg-Interface.cmake b/cmake/Msg-Interface.cmake
index 9c119f2..dd6f425 100644
--- a/cmake/Msg-Interface.cmake
+++ b/cmake/Msg-Interface.cmake
@@ -21,6 +21,7 @@ function(add_interface)
 	add_custom_command(
 		OUTPUT ${header_path}
 		COMMAND	${XPCG} ${arg_PATH}
+		DEPENDS ${arg_PATH}
 		WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${arg_PARENT_DIR}
 		COMMENT "Generating interface: ${arg_NAME}")