diff --git a/libstdc++-v3/include/bits/hashtable.h b/libstdc++-v3/include/bits/hashtable.h
index 2dc24985d58..cd60fb58c75 100644
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -2219,7 +2219,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	   typename _ExtractKey, typename _Equal,
 	   typename _Hash, typename _RangeHash, typename _Unused,
 	   typename _RehashPolicy, typename _Traits>
-    auto
+    inline auto
     _Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal,
 	       _Hash, _RangeHash, _Unused, _RehashPolicy, _Traits>::
     _M_locate(const key_type& __k) const