diff --git a/src/util/FormatString.cxx b/src/util/FormatString.cxx
deleted file mode 100644
index 20a3f20fe..000000000
--- a/src/util/FormatString.cxx
+++ /dev/null
@@ -1,35 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-// Copyright The Music Player Daemon Project
-
-#include "FormatString.hxx"
-#include "AllocatedString.hxx"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-AllocatedString
-FormatStringV(const char *fmt, std::va_list args) noexcept
-{
-	std::va_list tmp;
-	va_copy(tmp, args);
-	const int length = vsnprintf(nullptr, 0, fmt, tmp);
-	va_end(tmp);
-
-	if (length <= 0)
-		/* wtf.. */
-		abort();
-
-	char *buffer = new char[length + 1];
-	vsnprintf(buffer, length + 1, fmt, args);
-	return AllocatedString::Donate(buffer);
-}
-
-AllocatedString
-FormatString(const char *fmt, ...) noexcept
-{
-	std::va_list args;
-	va_start(args, fmt);
-	auto p = FormatStringV(fmt, args);
-	va_end(args);
-	return p;
-}
diff --git a/src/util/FormatString.hxx b/src/util/FormatString.hxx
deleted file mode 100644
index 3b0b039bc..000000000
--- a/src/util/FormatString.hxx
+++ /dev/null
@@ -1,28 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-// Copyright The Music Player Daemon Project
-
-#ifndef MPD_FORMAT_STRING_HXX
-#define MPD_FORMAT_STRING_HXX
-
-#include "Compiler.h"
-
-#include <cstdarg>
-
-class AllocatedString;
-
-/**
- * Format into an #AllocatedString.
- */
-[[gnu::nonnull]]
-AllocatedString
-FormatStringV(const char *fmt, std::va_list args) noexcept;
-
-/**
- * Format into an #AllocatedString.
- */
-[[gnu::nonnull(1)]]
-gcc_printf(1,2)
-AllocatedString
-FormatString(const char *fmt, ...) noexcept;
-
-#endif
diff --git a/src/util/meson.build b/src/util/meson.build
index 6fc6b89c0..0e41fc20d 100644
--- a/src/util/meson.build
+++ b/src/util/meson.build
@@ -11,7 +11,6 @@ util = static_library(
   'WStringCompare.cxx',
   'DivideString.cxx',
   'SplitString.cxx',
-  'FormatString.cxx',
   'Tokenizer.cxx',
   'UriExtract.cxx',
   'UriQueryParser.cxx',