diff --git a/shared-bindings/bitmaptools/__init__.c b/shared-bindings/bitmaptools/__init__.c
index f3aad1b67b046..4d56f393189e4 100644
--- a/shared-bindings/bitmaptools/__init__.c
+++ b/shared-bindings/bitmaptools/__init__.c
@@ -206,9 +206,9 @@ static mp_obj_t bitmaptools_obj_rotozoom(size_t n_args, const mp_obj_t *pos_args
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj); // the destination bitmap
+    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap)); // the destination bitmap
 
-    displayio_bitmap_t *source = MP_OBJ_TO_PTR(args[ARG_source_bitmap].u_obj); // the source bitmap
+    displayio_bitmap_t *source = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_source_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_source_bitmap)); // the source bitmap
 
     // ensure that the destination bitmap has at least as many `bits_per_value` as the source
     if (destination->bits_per_value < source->bits_per_value) {
@@ -485,7 +485,7 @@ static mp_obj_t bitmaptools_obj_fill_region(size_t n_args, const mp_obj_t *pos_a
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj);     // the destination bitmap
+    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap)); // the destination bitmap
 
     uint32_t value, color_depth;
     value = args[ARG_value].u_int;
@@ -598,7 +598,7 @@ static mp_obj_t bitmaptools_obj_draw_line(size_t n_args, const mp_obj_t *pos_arg
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj);     // the destination bitmap
+    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap)); // the destination bitmap
 
     uint32_t value, color_depth;
     value = args[ARG_value].u_int;
@@ -684,7 +684,7 @@ static mp_obj_t bitmaptools_obj_draw_polygon(size_t n_args, const mp_obj_t *pos_
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj);     // the destination bitmap
+    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap)); // the destination bitmap
 
     mp_buffer_info_t xs_buf, ys_buf;
     mp_get_buffer_raise(args[ARG_xs].u_obj, &xs_buf, MP_BUFFER_READ);
@@ -1017,7 +1017,7 @@ static mp_obj_t bitmaptools_obj_draw_circle(size_t n_args, const mp_obj_t *pos_a
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(args[ARG_dest_bitmap].u_obj);     // the destination bitmap
+    displayio_bitmap_t *destination = MP_OBJ_TO_PTR(mp_arg_validate_type(args[ARG_dest_bitmap].u_obj, &displayio_bitmap_type, MP_QSTR_dest_bitmap)); // the destination bitmap
 
     uint32_t value, color_depth;
     value = args[ARG_value].u_int;