diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 2c81267e12..b29162515b 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -993,6 +993,8 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 avi->movi_end  = avi->fsize;
                 goto end_of_header;
             }
+        /* Do not fail for very large idx1 tags */
+        case MKTAG('i', 'd', 'x', '1'):
             /* skip tag */
             size += (size & 1);
             avio_skip(pb, size);