diff --git a/lib/base/CMakeLists.txt b/lib/base/CMakeLists.txt
index 108ca27c1..2a5391818 100644
--- a/lib/base/CMakeLists.txt
+++ b/lib/base/CMakeLists.txt
@@ -70,7 +70,6 @@ set(base_SOURCES
   stream.cpp stream.hpp
   streamlogger.cpp streamlogger.hpp streamlogger-ti.hpp
   string.cpp string.hpp string-script.cpp
-  stringbuilder.cpp stringbuilder.hpp
   sysloglogger.cpp sysloglogger.hpp sysloglogger-ti.hpp
   tcpsocket.cpp tcpsocket.hpp
   threadpool.cpp threadpool.hpp
diff --git a/lib/base/stringbuilder.cpp b/lib/base/stringbuilder.cpp
deleted file mode 100644
index 5b5a508ec..000000000
--- a/lib/base/stringbuilder.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
-
-#include "base/stringbuilder.hpp"
-#include <cstring>
-
-using namespace icinga;
-
-void StringBuilder::Append(const String& str)
-{
-	m_Buffer.insert(m_Buffer.end(), str.Begin(), str.End());
-}
-
-void StringBuilder::Append(const std::string& str)
-{
-	m_Buffer.insert(m_Buffer.end(), str.begin(), str.end());
-}
-
-void StringBuilder::Append(const char *begin, const char *end)
-{
-	m_Buffer.insert(m_Buffer.end(), begin, end);
-}
-
-void StringBuilder::Append(const char *cstr)
-{
-	m_Buffer.insert(m_Buffer.end(), cstr, cstr + std::strlen(cstr));
-}
-
-void StringBuilder::Append(char chr)
-{
-	m_Buffer.emplace_back(chr);
-}
-
-String StringBuilder::ToString() const
-{
-	return String(m_Buffer.data(), m_Buffer.data() + m_Buffer.size());
-}
diff --git a/lib/base/stringbuilder.hpp b/lib/base/stringbuilder.hpp
deleted file mode 100644
index 4d806f4b7..000000000
--- a/lib/base/stringbuilder.hpp
+++ /dev/null
@@ -1,36 +0,0 @@
-/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
-
-#ifndef STRINGBUILDER_H
-#define STRINGBUILDER_H
-
-#include "base/i2-base.hpp"
-#include "base/string.hpp"
-#include <string>
-#include <vector>
-
-namespace icinga
-{
-
-/**
- * A string builder.
- *
- * @ingroup base
- */
-class StringBuilder final
-{
-public:
-	void Append(const String&);
-	void Append(const std::string&);
-	void Append(const char *, const char *);
-	void Append(const char *);
-	void Append(char);
-
-	String ToString() const;
-
-private:
-	std::vector<char> m_Buffer;
-};
-
-}
-
-#endif /* STRINGBUILDER_H */