diff --git a/include/boost/unordered/unordered_flat_map.hpp b/include/boost/unordered/unordered_flat_map.hpp
index dd464eb2..4991b675 100644
--- a/include/boost/unordered/unordered_flat_map.hpp
+++ b/include/boost/unordered/unordered_flat_map.hpp
@@ -46,12 +46,12 @@ namespace boost {
         using value_type = std::pair<Key const, T>;
 
         template <class K, class V>
-        static raw_key_type const& extract(std::pair<K, V> const& kv)
+        static inline raw_key_type const& extract(std::pair<K, V> const& kv)
         {
           return kv.first;
         }
 
-        static moved_type move(value_type& x)
+        static inline moved_type move(value_type& x)
         {
           // TODO: we probably need to launder here
           return {std::move(const_cast<raw_key_type&>(x.first)),
diff --git a/include/boost/unordered/unordered_flat_set.hpp b/include/boost/unordered/unordered_flat_set.hpp
index 1950dfb3..b3042ca9 100644
--- a/include/boost/unordered/unordered_flat_set.hpp
+++ b/include/boost/unordered/unordered_flat_set.hpp
@@ -38,8 +38,8 @@ namespace boost {
         using key_type = Key;
         using init_type = Key;
         using value_type = Key;
-        static Key const& extract(value_type const& key) { return key; }
-        static Key&& move(value_type& x) { return std::move(x); }
+        static inline Key const& extract(value_type const& key) { return key; }
+        static inline Key&& move(value_type& x) { return std::move(x); }
       };
 
       using table_type = detail::foa::table<set_types, Hash, KeyEqual,