diff --git a/bytebeat_compiler.py b/bytebeat_compiler.py
index 0b541e1..af8ded5 100644
--- a/bytebeat_compiler.py
+++ b/bytebeat_compiler.py
@@ -60,7 +60,7 @@ def fetch(name: str):
 def read_file(path: str) -> str:
 	return open(path, "r", encoding="utf-8-sig").read()
 
-def rewrite_file(path: str, content: str):
+def rewrite_file(path: str, content: str) -> int:
 	return open(path, "w", encoding="utf-8").write(content)
 
 def read_from_file_or_stdin(path: str) -> str: