diff --git a/src/mem/globalalloc.h b/src/mem/globalalloc.h
index 92ade2c..2cdb5c4 100644
--- a/src/mem/globalalloc.h
+++ b/src/mem/globalalloc.h
@@ -170,6 +170,8 @@ namespace snmalloc
       {
         error("debug_check_empty: found non-empty allocators");
       }
+#else
+      UNUSED(result);
 #endif
     }
   };