diff --git a/stdlib/2and3/zipfile.pyi b/stdlib/2and3/zipfile.pyi
index 72021f35e..7161afeb2 100644
--- a/stdlib/2and3/zipfile.pyi
+++ b/stdlib/2and3/zipfile.pyi
@@ -106,7 +106,7 @@ class ZipFile:
 class PyZipFile(ZipFile):
     if sys.version_info >= (3,):
         def __init__(
-            self, file: Union[str, IO[bytes]], mode: str = ..., compression: int = ..., allowZip64: bool = ..., opimize: int = ...
+            self, file: Union[str, IO[bytes]], mode: str = ..., compression: int = ..., allowZip64: bool = ..., optimize: int = ...
         ) -> None: ...
         def writepy(self, pathname: str, basename: str = ..., filterfunc: Optional[Callable[[str], bool]] = ...) -> None: ...
     else: