diff --git a/youtube_dl/extractor/nationalgeographic.py b/youtube_dl/extractor/nationalgeographic.py
index fe43d4bc8b..4bffcf704d 100644
--- a/youtube_dl/extractor/nationalgeographic.py
+++ b/youtube_dl/extractor/nationalgeographic.py
@@ -161,8 +161,8 @@ def _real_extract(self, url):
             r'<div[^>]+class="select-seasons[^"]*".*?<a[^>]*>(.*?)</a>',
             webpage, 'selected season')
         entries = [
-            self.url_result(self._proto_relative_url(url), 'NationalGeographic')
-            for url in re.findall('(?s)<div[^>]+class="col-inner"[^>]*?>.*?<a[^>]+href="([^"]+)"', webpage)]
+            self.url_result(self._proto_relative_url(entry_url), 'NationalGeographic')
+            for entry_url in re.findall('(?s)<div[^>]+class="col-inner"[^>]*?>.*?<a[^>]+href="([^"]+)"', webpage)]
         return self.playlist_result(
             entries, '%s-%s' % (display_id, selected_season.lower().replace(' ', '-')),
             '%s - %s' % (show, selected_season))