diff --git a/src/alloc2/DArena.cpp b/src/alloc2/DArena.cpp
index d9dd832..a2bcd0e 100644
--- a/src/alloc2/DArena.cpp
+++ b/src/alloc2/DArena.cpp
@@ -299,7 +299,7 @@ namespace xo {
                 return nullptr;
             }
 
-            return (AllocHeader *)lo_;
+            return (AllocHeader *)(lo_ + config_.header_.guard_z_);
         }
 
         AllocHeader *