diff --git a/gallery_dl/extractor/danbooru.py b/gallery_dl/extractor/danbooru.py
index 09beb5f1..ae9ebcbf 100644
--- a/gallery_dl/extractor/danbooru.py
+++ b/gallery_dl/extractor/danbooru.py
@@ -93,7 +93,8 @@ class DanbooruExtractor(BaseExtractor):
 
             if post["extension"] == "zip":
                 if self.ugoira:
-                    post["frames"] = self._ugoira_frames(post)
+                    post["_ugoira_frame_data"] = post["frames"] = \
+                        self._ugoira_frames(post)
                     post["_http_adjust_extension"] = False
                 else:
                     url = post["large_file_url"]
diff --git a/gallery_dl/extractor/pixiv.py b/gallery_dl/extractor/pixiv.py
index aed78d1d..68b9eef8 100644
--- a/gallery_dl/extractor/pixiv.py
+++ b/gallery_dl/extractor/pixiv.py
@@ -136,7 +136,7 @@ class PixivExtractor(Extractor):
     def _extract_ugoira(self, work):
         ugoira = self.api.ugoira_metadata(work["id"])
         url = ugoira["zip_urls"]["medium"]
-        work["frames"] = frames = ugoira["frames"]
+        work["_ugoira_frame_data"] = work["frames"] = frames = ugoira["frames"]
         work["date_url"] = self._date_from_url(url)
         work["_http_adjust_extension"] = False
 
diff --git a/gallery_dl/postprocessor/ugoira.py b/gallery_dl/postprocessor/ugoira.py
index 247cc0f4..ae720713 100644
--- a/gallery_dl/postprocessor/ugoira.py
+++ b/gallery_dl/postprocessor/ugoira.py
@@ -105,11 +105,11 @@ class UgoiraPP(PostProcessor):
         }, options)
 
     def prepare(self, pathfmt):
-        if "frames" not in pathfmt.kwdict:
+        if "_ugoira_frame_data" not in pathfmt.kwdict:
             self._frames = None
             return
 
-        self._frames = pathfmt.kwdict["frames"]
+        self._frames = pathfmt.kwdict["_ugoira_frame_data"]
         if pathfmt.extension == "zip":
             self._convert_zip = True
             if self.delete: