diff --git a/src/client/ClientInternal.hxx b/src/client/ClientInternal.hxx
index 87a1f403b..37b5925f2 100644
--- a/src/client/ClientInternal.hxx
+++ b/src/client/ClientInternal.hxx
@@ -35,6 +35,6 @@ extern size_t client_max_command_list_size;
 extern size_t client_max_output_buffer_size;
 
 CommandResult
-client_process_line(Client &client, char *line);
+client_process_line(Client &client, char *line) noexcept;
 
 #endif
diff --git a/src/client/ClientProcess.cxx b/src/client/ClientProcess.cxx
index 547aa8c71..eeb72d35a 100644
--- a/src/client/ClientProcess.cxx
+++ b/src/client/ClientProcess.cxx
@@ -30,7 +30,7 @@
 
 static CommandResult
 client_process_command_list(Client &client, bool list_ok,
-			    std::list<std::string> &&list)
+			    std::list<std::string> &&list) noexcept
 {
 	CommandResult ret = CommandResult::OK;
 	unsigned num = 0;
@@ -51,7 +51,7 @@ client_process_command_list(Client &client, bool list_ok,
 }
 
 CommandResult
-client_process_line(Client &client, char *line)
+client_process_line(Client &client, char *line) noexcept
 {
 	CommandResult ret;