diff --git a/libavcodec/xbmenc.c b/libavcodec/xbmenc.c
index 3fc0e3185a..193ced652a 100644
--- a/libavcodec/xbmenc.c
+++ b/libavcodec/xbmenc.c
@@ -32,7 +32,7 @@ static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 
     linesize = (avctx->width + 7) / 8;
     commas   = avctx->height * linesize;
-    size     = avctx->height * (linesize * 7 + 2) + 109;
+    size     = avctx->height * (linesize * 6 + 1) + 106;
     if ((ret = ff_alloc_packet2(avctx, pkt, size, 0)) < 0)
         return ret;
 
@@ -41,7 +41,7 @@ static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 
     buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
     buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
-    buf += snprintf(buf, 40, "static unsigned char image_bits[] = {\n");
+    buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
     for (i = 0; i < avctx->height; i++) {
         for (j = 0; j < linesize; j++) {
             buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);