diff --git a/yt_dlp/extractor/instagram.py b/yt_dlp/extractor/instagram.py
index 3d40550124..94a685cd84 100644
--- a/yt_dlp/extractor/instagram.py
+++ b/yt_dlp/extractor/instagram.py
@@ -33,8 +33,10 @@ def _pk_to_id(media_id):
 
 
 def _id_to_pk(shortcode):
-    """Covert a shortcode to a numeric value"""
-    return decode_base_n(shortcode[:11], table=_ENCODING_CHARS)
+    """Convert a shortcode to a numeric value"""
+    if len(shortcode) > 28:
+        shortcode = shortcode[:-28]
+    return decode_base_n(shortcode, table=_ENCODING_CHARS)
 
 
 class InstagramBaseIE(InfoExtractor):