diff --git a/stdlib/ftplib.pyi b/stdlib/ftplib.pyi
index d3e4758aec47..bdb1716549c0 100644
--- a/stdlib/ftplib.pyi
+++ b/stdlib/ftplib.pyi
@@ -22,7 +22,7 @@ class error_temp(Error): ...
 class error_perm(Error): ...
 class error_proto(Error): ...
 
-all_errors = Tuple[Type[Exception], ...]
+all_errors: Tuple[Type[Exception], ...]
 
 class FTP:
     debugging: int