diff --git a/libavutil/hmac.c b/libavutil/hmac.c
index 02bdc182a1..300436cb07 100644
--- a/libavutil/hmac.c
+++ b/libavutil/hmac.c
@@ -127,7 +127,7 @@ void av_hmac_free(AVHMAC *c)
 {
     if (!c)
         return;
-    av_free(c->hash);
+    av_freep(&c->hash);
     av_free(c);
 }