diff --git a/modules/packetizer/av1.c b/modules/packetizer/av1.c
index 713748b3e9470f629eadbdb4fdd024847e52693f..96262d8843fc6717c3f4a86cc13c8d2695e67193 100644
--- a/modules/packetizer/av1.c
+++ b/modules/packetizer/av1.c
@@ -159,6 +159,7 @@ static void UpdateDecoderFormat(decoder_t *p_dec)
     {
         free(p_dec->fmt_out.p_extra);
         p_dec->fmt_out.i_extra = 0;
+        p_dec->fmt_out.p_extra = NULL;
     }
 
     if(p_dec->fmt_out.i_extra <= 4)