diff --git a/facefusion/exit_helper.py b/facefusion/exit_helper.py
index 302949ef..1a37331a 100644
--- a/facefusion/exit_helper.py
+++ b/facefusion/exit_helper.py
@@ -3,25 +3,26 @@ import signal
 import sys
 from time import sleep
 from types import FrameType
+from typing import NoReturn
 
 from facefusion import process_manager, state_manager
 from facefusion.temp_helper import clear_temp_directory
 from facefusion.types import ErrorCode
 
 
-def fatal_exit(error_code : ErrorCode) -> None:
+def fatal_exit(error_code : ErrorCode) -> NoReturn:
 	os._exit(error_code)
 
 
-def hard_exit(error_code : ErrorCode) -> None:
+def hard_exit(error_code : ErrorCode) -> NoReturn:
 	sys.exit(error_code)
 
 
-def signal_exit(signum : int, frame : FrameType) -> None:
+def signal_exit(signum : int, frame : FrameType) -> NoReturn:
 	graceful_exit(0)
 
 
-def graceful_exit(error_code : ErrorCode) -> None:
+def graceful_exit(error_code : ErrorCode) -> NoReturn:
 	signal.signal(signal.SIGINT, signal.SIG_IGN)
 	process_manager.stop()
 
diff --git a/facefusion/installer.py b/facefusion/installer.py
index 553ed08c..51d0a452 100644
--- a/facefusion/installer.py
+++ b/facefusion/installer.py
@@ -6,6 +6,7 @@ import sys
 from argparse import ArgumentParser, HelpFormatter
 from functools import partial
 from types import FrameType
+from typing import NoReturn
 
 from facefusion import metadata
 from facefusion.common_helper import is_linux, is_windows
@@ -43,7 +44,7 @@ def cli() -> None:
 	run(program)
 
 
-def signal_exit(signum : int, frame : FrameType) -> None:
+def signal_exit(signum : int, frame : FrameType) -> NoReturn:
 	sys.exit(0)