diff --git a/src/internal.c b/src/internal.c
index 067ca4e0b..5de270017 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -8243,6 +8243,7 @@ static DtlsFragBucket* DtlsMsgCreateFragBucket(word32 offset, const byte* data,
         if (data != NULL)
             XMEMCPY(bucket->buf, data, dataSz);
     }
+    (void)heap;
     return bucket;
 }