diff --git a/xo-alloc2/src/alloc2/DArena.cpp b/xo-alloc2/src/alloc2/DArena.cpp
index d9dd832d..a2bcd0e6 100644
--- a/xo-alloc2/src/alloc2/DArena.cpp
+++ b/xo-alloc2/src/alloc2/DArena.cpp
@@ -299,7 +299,7 @@ namespace xo {
                 return nullptr;
             }
 
-            return (AllocHeader *)lo_;
+            return (AllocHeader *)(lo_ + config_.header_.guard_z_);
         }
 
         AllocHeader *