diff --git a/PIL/Image.py b/PIL/Image.py
index c54349d15..96ab09efc 100644
--- a/PIL/Image.py
+++ b/PIL/Image.py
@@ -539,7 +539,7 @@ class Image(object):
         self.palette = None  # type: Optional[ImagePalette.ImagePalette]
         self.info = {}       # type: Dict[Text, Any]
         self.category = NORMAL
-        self.readonly = 0
+        self.readonly = 0    # type: int
         self.pyaccess = None
 
     @property
diff --git a/PIL/_imaging.pyi b/PIL/_imaging.pyi
index a8f20fe14..f5d691c7c 100644
--- a/PIL/_imaging.pyi
+++ b/PIL/_imaging.pyi
@@ -37,7 +37,7 @@ class ImagingCore:
 
     def getpixel(self, xy: XY) -> Optional[Any]: ...
     def putpixel(self, xy: XY, value: Any) -> None: ...
-    def pixel_access(self, readonly: bool) -> Any: ...
+    def pixel_access(self, readonly: int) -> Any: ...
 
     def convert(self, mode, dither, paletteimage): ...
     def convert2(self): ... ###