diff --git a/include/nlohmann/detail/input/input_adapters.hpp b/include/nlohmann/detail/input/input_adapters.hpp
index bfb810667..52d221b54 100644
--- a/include/nlohmann/detail/input/input_adapters.hpp
+++ b/include/nlohmann/detail/input/input_adapters.hpp
@@ -526,8 +526,7 @@ struct container_input_adapter_factory< ContainerType,
 }  // namespace container_input_adapter_factory_impl
 
 template<typename ContainerType>
-auto input_adapter(ContainerType&& container)
--> typename container_input_adapter_factory_impl::container_input_adapter_factory<ContainerType>::adapter_type
+typename container_input_adapter_factory_impl::container_input_adapter_factory<ContainerType>::adapter_type input_adapter(ContainerType&& container)
 {
     return container_input_adapter_factory_impl::container_input_adapter_factory<ContainerType>::create(std::forward<ContainerType>(container));
 }
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 74402293e..5395609f0 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -7363,8 +7363,7 @@ struct container_input_adapter_factory< ContainerType,
 }  // namespace container_input_adapter_factory_impl
 
 template<typename ContainerType>
-auto input_adapter(ContainerType&& container)
--> typename container_input_adapter_factory_impl::container_input_adapter_factory<ContainerType>::adapter_type
+typename container_input_adapter_factory_impl::container_input_adapter_factory<ContainerType>::adapter_type input_adapter(ContainerType&& container)
 {
     return container_input_adapter_factory_impl::container_input_adapter_factory<ContainerType>::create(std::forward<ContainerType>(container));
 }