diff --git a/src/mem/cache/tags/fa_lru.cc b/src/mem/cache/tags/fa_lru.cc
index 49c0d34..f515c4d 100644
--- a/src/mem/cache/tags/fa_lru.cc
+++ b/src/mem/cache/tags/fa_lru.cc
@@ -179,6 +179,7 @@
 
     if (blk && blk->isValid()) {
         assert(blk->tag == blkAddr);
+        assert(blk->isSecure() == is_secure);
     } else {
         blk = nullptr;
     }