diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 0d9eca3325..0d61e654e3 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -60,7 +60,7 @@ typedef struct Jpeg2000Tile {
     uint8_t             properties[4];
     Jpeg2000CodingStyle codsty[4];
     Jpeg2000QuantStyle  qntsty[4];
-    Jpeg2000TilePart    tile_part[4];
+    Jpeg2000TilePart    tile_part[6];
     uint16_t tp_idx;                    // Tile-part index
 } Jpeg2000Tile;