diff --git a/src/Tools/DesignTools/Bucket.gd b/src/Tools/DesignTools/Bucket.gd
index 5a96594bd..801b4e634 100644
--- a/src/Tools/DesignTools/Bucket.gd
+++ b/src/Tools/DesignTools/Bucket.gd
@@ -269,9 +269,11 @@ func fill_in_selection() -> void:
 			var selection_map_copy := project.selection_map.return_cropped_copy(project.size)
 			for image in images:
 				image.blit_rect_mask(filler, selection_map_copy, rect, rect.position)
+				image.convert_rgb_to_indexed()
 		else:
 			for image in images:
 				image.fill(tool_slot.color)
+				image.convert_rgb_to_indexed()
 	else:
 		# End early if we are filling with an empty pattern
 		var pattern_image: Image = _pattern.image
diff --git a/src/UI/Canvas/Selection.gd b/src/UI/Canvas/Selection.gd
index 2149ad90c..1301d1e4e 100644
--- a/src/UI/Canvas/Selection.gd
+++ b/src/UI/Canvas/Selection.gd
@@ -808,9 +808,11 @@ func delete(selected_cels := true) -> void:
 			image.blit_rect_mask(
 				blank, selection_map_copy, big_bounding_rectangle, big_bounding_rectangle.position
 			)
+			image.convert_rgb_to_indexed()
 	else:
 		for image in images:
 			image.fill(0)
+			image.convert_rgb_to_indexed()
 	commit_undo("Draw", undo_data_tmp)