diff --git a/libavcodec/dvdsub.c b/libavcodec/dvdsub.c
index a03ff27754..87215d2bd1 100644
--- a/libavcodec/dvdsub.c
+++ b/libavcodec/dvdsub.c
@@ -26,7 +26,7 @@
 void ff_dvdsub_parse_palette(uint32_t *palette, const char *p)
 {
     for (int i = 0; i < 16; i++) {
-        palette[i] = strtoul(p, &p, 16);
+        palette[i] = strtoul(p, (char **)&p, 16);
         while (*p == ',' || av_isspace(*p))
             p++;
     }