diff --git a/kitty/rc/set_background_image.py b/kitty/rc/set_background_image.py
index c6c7f360c..9601fbbc7 100644
--- a/kitty/rc/set_background_image.py
+++ b/kitty/rc/set_background_image.py
@@ -6,7 +6,6 @@ import os
 import tempfile
 from base64 import standard_b64decode, standard_b64encode
 from typing import IO, TYPE_CHECKING, Dict, Optional
-from uuid import uuid4
 
 from kitty.types import AsyncResponse
 
@@ -75,7 +74,6 @@ failed, the command will exit with a success code.
             'configured': opts.configured,
             'layout': opts.layout,
             'all': opts.all,
-            'img_id': str(uuid4())
         }
         if path.lower() == 'none':
             ret['data'] = '-'
@@ -100,7 +98,7 @@ failed, the command will exit with a success code.
         img_id = payload_get('async_id')
         if data != '-':
             if img_id not in self.images_in_flight:
-                self.images_in_flight[img_id] = tempfile.NamedTemporaryFile()
+                self.images_in_flight[img_id] = tempfile.NamedTemporaryFile(suffix='.png')
             if data:
                 self.images_in_flight[img_id].write(standard_b64decode(data))
                 return AsyncResponse()
diff --git a/kitty/rc/set_window_logo.py b/kitty/rc/set_window_logo.py
index 46c92a108..d05b56005 100644
--- a/kitty/rc/set_window_logo.py
+++ b/kitty/rc/set_window_logo.py
@@ -7,7 +7,6 @@ import os
 import tempfile
 from base64 import standard_b64decode, standard_b64encode
 from typing import IO, TYPE_CHECKING, Dict, Optional
-from uuid import uuid4
 
 from kitty.types import AsyncResponse
 
@@ -24,7 +23,6 @@ class SetWindowLogo(RemoteCommand):
     '''
     data+: Chunk of at most 512 bytes of PNG data, base64 encoded. Must send an empty chunk to indicate end of image. \
     Or the special value - to indicate image must be removed.
-    img_id+: Unique uuid (as string) used for chunking
     position: The logo position as a string, empty string means default
     alpha: The logo alpha between 0 and 1. -1 means use default
     match: Which window to change the logo in
@@ -74,7 +72,6 @@ failed, the command will exit with a success code.
         ret = {
             'match': opts.match,
             'self': opts.self,
-            'img_id': str(uuid4()),
             'alpha': opts.alpha,
             'position': opts.position,
         }
@@ -101,7 +98,7 @@ failed, the command will exit with a success code.
         img_id = payload_get('async_id')
         if data != '-':
             if img_id not in self.images_in_flight:
-                self.images_in_flight[img_id] = tempfile.NamedTemporaryFile()
+                self.images_in_flight[img_id] = tempfile.NamedTemporaryFile(suffix='.png')
             if data:
                 self.images_in_flight[img_id].write(standard_b64decode(data))
                 return AsyncResponse()