diff --git a/include/boost/unordered/detail/foa.hpp b/include/boost/unordered/detail/foa.hpp
index c5c7abe6..67c0a46f 100644
--- a/include/boost/unordered/detail/foa.hpp
+++ b/include/boost/unordered/detail/foa.hpp
@@ -892,6 +892,7 @@ private:
 
   inline void increment()noexcept
   {
+    BOOST_UNORDERED_ASSUME(p!=nullptr);
     increment(std::integral_constant<bool,regular_layout>{});
   }