diff --git a/include/boost/json/impl/object.hpp b/include/boost/json/impl/object.hpp
index 7417e7da..73004fb9 100644
--- a/include/boost/json/impl/object.hpp
+++ b/include/boost/json/impl/object.hpp
@@ -299,6 +299,36 @@ capacity() const noexcept ->
     return t_->capacity;
 }
 
+//----------------------------------------------------------
+//
+// Lookup
+//
+//----------------------------------------------------------
+
+auto
+object::
+at(string_view key) ->
+    value&
+{
+    auto it = find(key);
+    if(it == end())
+        detail::throw_out_of_range(
+            BOOST_CURRENT_LOCATION);
+    return it->value();
+}
+    
+auto
+object::
+at(string_view key) const ->
+    value const&
+{
+    auto it = find(key);
+    if(it == end())
+        detail::throw_out_of_range(
+            BOOST_CURRENT_LOCATION);
+    return it->value();
+}
+
 //----------------------------------------------------------
 
 template<class P, class>
diff --git a/include/boost/json/impl/object.ipp b/include/boost/json/impl/object.ipp
index 9fb82c1d..f075d004 100644
--- a/include/boost/json/impl/object.ipp
+++ b/include/boost/json/impl/object.ipp
@@ -460,30 +460,6 @@ swap(object& other)
 //
 //----------------------------------------------------------
 
-auto
-object::
-at(string_view key) ->
-    value&
-{
-    auto it = find(key);
-    if(it == end())
-        detail::throw_out_of_range(
-            BOOST_CURRENT_LOCATION);
-    return it->value();
-}
-    
-auto
-object::
-at(string_view key) const ->
-    value const&
-{
-    auto it = find(key);
-    if(it == end())
-        detail::throw_out_of_range(
-            BOOST_CURRENT_LOCATION);
-    return it->value();
-}
-
 auto
 object::
 operator[](string_view key) ->
diff --git a/include/boost/json/object.hpp b/include/boost/json/object.hpp
index a80378d9..69c614ad 100644
--- a/include/boost/json/object.hpp
+++ b/include/boost/json/object.hpp
@@ -1257,7 +1257,7 @@ public:
 
         @throw std::out_of_range if no such element exists.
     */
-    BOOST_JSON_DECL
+    inline
     value&
     at(string_view key);
 
@@ -1278,7 +1278,7 @@ public:
 
         @throw std::out_of_range if no such element exists.
     */
-    BOOST_JSON_DECL
+    inline
     value const&
     at(string_view key) const;