diff --git a/modules/codec/videotoolbox.m b/modules/codec/videotoolbox.m
index 415052d68b205a50bf9b524d861a4757cd86aec5..61d86e89d639b90854159ebdbaef1d4aad19ad60 100644
--- a/modules/codec/videotoolbox.m
+++ b/modules/codec/videotoolbox.m
@@ -308,7 +308,6 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
 
         if (p_block == NULL) {
             int buf_size = p_dec->fmt_in.i_extra + 20;
-            uint32_t i_nal_size = 0;
             size = p_dec->fmt_in.i_extra;
 
             p_alloc_buf = p_buf = malloc(buf_size);