diff --git a/include/boost/unordered/detail/foa/concurrent_table.hpp b/include/boost/unordered/detail/foa/concurrent_table.hpp
index 9a8be3f6..b56d7f1e 100644
--- a/include/boost/unordered/detail/foa/concurrent_table.hpp
+++ b/include/boost/unordered/detail/foa/concurrent_table.hpp
@@ -146,7 +146,7 @@ struct atomic_integral
 {
   operator Integral()const{return n.load(std::memory_order_relaxed);}
   void operator=(Integral m){n.store(m,std::memory_order_relaxed);}
-  void operator|=(Integral m){n.fetch_or(m,std::memory_order_acq_rel);}
+  void operator|=(Integral m){n.fetch_or(m,std::memory_order_relaxed);}
   void operator&=(Integral m){n.fetch_and(m,std::memory_order_acq_rel);}
 
   std::atomic<Integral> n;