diff --git a/meson.build b/meson.build
index a9d50c9da..9f2edf35b 100644
--- a/meson.build
+++ b/meson.build
@@ -265,7 +265,6 @@ sources = [
   version_cxx,
   'src/Main.cxx',
   'src/protocol/ArgParser.cxx',
-  'src/protocol/Result.cxx',
   'src/command/CommandError.cxx',
   'src/command/PositionArg.cxx',
   'src/command/AllCommands.cxx',
diff --git a/src/client/Client.hxx b/src/client/Client.hxx
index 5f9c6d10e..9ca7c6d3b 100644
--- a/src/client/Client.hxx
+++ b/src/client/Client.hxx
@@ -154,6 +154,10 @@ public:
 		return Write(s.data(), s.size());
 	}
 
+	bool WriteOK() noexcept {
+		return Write("OK\n");
+	}
+
 	/**
 	 * returns the uid of the client process, or a negative value
 	 * if the uid is unknown
diff --git a/src/client/Process.cxx b/src/client/Process.cxx
index 65c295032..041e339c7 100644
--- a/src/client/Process.cxx
+++ b/src/client/Process.cxx
@@ -20,7 +20,6 @@
 #include "Client.hxx"
 #include "Config.hxx"
 #include "Domain.hxx"
-#include "protocol/Result.hxx"
 #include "command/AllCommands.hxx"
 #include "Log.hxx"
 #include "util/StringAPI.hxx"
@@ -72,7 +71,7 @@ Client::ProcessLine(char *line) noexcept
 		if (idle_waiting) {
 			/* send empty idle response and leave idle mode */
 			idle_waiting = false;
-			command_success(*this);
+			WriteOK();
 		}
 
 		/* do nothing if the client wasn't idling: the client
@@ -108,7 +107,7 @@ Client::ProcessLine(char *line) noexcept
 				 "list returned {}", id, unsigned(ret));
 
 			if (ret == CommandResult::OK)
-				command_success(*this);
+				WriteOK();
 
 			return ret;
 		} else {
@@ -144,7 +143,7 @@ Client::ProcessLine(char *line) noexcept
 				return CommandResult::CLOSE;
 
 			if (ret == CommandResult::OK)
-				command_success(*this);
+				WriteOK();
 
 			return ret;
 		}
diff --git a/src/client/ThreadBackgroundCommand.cxx b/src/client/ThreadBackgroundCommand.cxx
index 4b8b05bb0..7026f709e 100644
--- a/src/client/ThreadBackgroundCommand.cxx
+++ b/src/client/ThreadBackgroundCommand.cxx
@@ -21,7 +21,6 @@
 #include "Client.hxx"
 #include "Response.hxx"
 #include "command/CommandError.hxx"
-#include "protocol/Result.hxx"
 
 ThreadBackgroundCommand::ThreadBackgroundCommand(Client &_client) noexcept
 	:thread(BIND_THIS_METHOD(_Run)),
@@ -57,7 +56,7 @@ ThreadBackgroundCommand::DeferredFinish() noexcept
 		PrintError(response, error);
 	} else {
 		SendResponse(response);
-		command_success(client);
+		client.WriteOK();
 	}
 
 	/* delete this object */
diff --git a/src/protocol/Result.cxx b/src/protocol/Result.cxx
deleted file mode 100644
index e43073c1d..000000000
--- a/src/protocol/Result.cxx
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright 2003-2021 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "Result.hxx"
-#include "client/Client.hxx"
-
-void
-command_success(Client &client)
-{
-	client.Write("OK\n");
-}
diff --git a/src/protocol/Result.hxx b/src/protocol/Result.hxx
deleted file mode 100644
index 9dd6d5290..000000000
--- a/src/protocol/Result.hxx
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright 2003-2021 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef MPD_PROTOCOL_RESULT_HXX
-#define MPD_PROTOCOL_RESULT_HXX
-
-class Client;
-
-void
-command_success(Client &client);
-
-#endif