diff --git a/include/boost/unordered/detail/foa.hpp b/include/boost/unordered/detail/foa.hpp
index 448ba371..eef0729c 100644
--- a/include/boost/unordered/detail/foa.hpp
+++ b/include/boost/unordered/detail/foa.hpp
@@ -1669,6 +1669,7 @@ private:
             auto nz=unchecked_countr_zero(mask);
             pg->reset(nz);
             if(!(--num_tx))goto continue_;
+            mask&=mask-1;
           }
         }
       continue_: