diff --git a/depends/md5/md5.cpp b/depends/md5/md5.cpp
index 5ee4fb45f..044df259e 100644
--- a/depends/md5/md5.cpp
+++ b/depends/md5/md5.cpp
@@ -135,7 +135,7 @@ void MD5Final(unsigned char digest[16], MD5Context *ctx)
     MD5Transform(ctx->buf, (uint32_t *) ctx->in);
     byteReverse((unsigned char *) ctx->buf, 4);
     memcpy(digest, ctx->buf, 16);
-    memset(ctx, 0, sizeof(ctx));        /* In case it's sensitive */
+    memset(ctx, 0, sizeof(*ctx));        /* In case it's sensitive */
 }