diff --git a/kitty/graphics.c b/kitty/graphics.c
index 115376255..a41a675a8 100644
--- a/kitty/graphics.c
+++ b/kitty/graphics.c
@@ -939,7 +939,7 @@ static PyMethodDef methods[] = {
 };
 
 static PyMemberDef members[] = {
-    {"image_count", T_UINT, offsetof(GraphicsManager, image_count), 0, "image_count"},
+    {"image_count", T_PYSSIZET, offsetof(GraphicsManager, image_count), 0, "image_count"},
     {NULL},
 };