diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
index 0ebd480d3f..724c7269dc 100644
--- a/libavformat/mp3enc.c
+++ b/libavformat/mp3enc.c
@@ -322,7 +322,6 @@ static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
     if (pkt->data && pkt->size >= 4) {
         MPADecodeHeader mpah;
         int ret;
-        av_unused int base;
         uint32_t h;
 
         h = AV_RB32(pkt->data);
@@ -339,7 +338,7 @@ static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
 
 #ifdef FILTER_VBR_HEADERS
         /* filter out XING and INFO headers. */
-        base = 4 + xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1];
+        int base = 4 + xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1];
 
         if (base + 4 <= pkt->size) {
             uint32_t v = AV_RB32(pkt->data + base);