diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index 4b07f1f8d4..7a8bd2f685 100644
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -25,6 +25,7 @@
  * JPEG-LS decoder.
  */
 
+#include "libavutil/attributes.h"
 #include "libavutil/mem.h"
 #include "avcodec.h"
 #include "codec_internal.h"
@@ -77,6 +78,7 @@ int ff_jpegls_decode_lse(MJpegDecodeContext *s)
         break;
     case 2:
         s->palette_index = 0;
+        av_fallthrough;
     case 3:
         tid= bytestream2_get_byte(&s->gB);
         wt = bytestream2_get_byte(&s->gB);