diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 5a63d7c81d..c037b6aa88 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -964,8 +964,13 @@ static int svg_probe(const AVProbeData *p)
 {
     const uint8_t *b = p->buf;
     const uint8_t *end = p->buf + p->buf_size;
-
-    if (memcmp(p->buf, "<?xml", 5))
+    while (b < end && av_isspace(*b))
+        b++;
+    if (b >= end - 5)
+        return 0;
+    if (!memcmp(b, "<svg", 4))
+        return AVPROBE_SCORE_EXTENSION + 1;
+    if (memcmp(p->buf, "<?xml", 5) && memcmp(b, "<!--", 4))
         return 0;
     while (b < end) {
         int inc = ff_subtitles_next_line(b);