diff --git a/lib/base/string.cpp b/lib/base/string.cpp
index 2806902ac..fa5027fb3 100644
--- a/lib/base/string.cpp
+++ b/lib/base/string.cpp
@@ -333,11 +333,21 @@ String icinga::operator+(const String& lhs, const char *rhs)
 	return lhs.GetData() + rhs;
 }
 
+String icinga::operator+(String&& lhs, const char *rhs)
+{
+	return std::move(lhs.GetData()) + rhs;
+}
+
 String icinga::operator+(const char *lhs, const String& rhs)
 {
 	return lhs + rhs.GetData();
 }
 
+String icinga::operator+(const char *lhs, String&& rhs)
+{
+	return lhs + std::move(rhs.GetData());
+}
+
 bool icinga::operator==(const String& lhs, const String& rhs)
 {
 	return lhs.GetData() == rhs.GetData();
diff --git a/lib/base/string.hpp b/lib/base/string.hpp
index 896c74d0b..0169a5e60 100644
--- a/lib/base/string.hpp
+++ b/lib/base/string.hpp
@@ -144,7 +144,9 @@ std::istream& operator>>(std::istream& stream, String& str);
 
 String operator+(const String& lhs, const String& rhs);
 String operator+(const String& lhs, const char *rhs);
+String operator+(String&& lhs, const char *rhs);
 String operator+(const char *lhs, const String& rhs);
+String operator+(const char *lhs, String&& rhs);
 
 bool operator==(const String& lhs, const String& rhs);
 bool operator==(const String& lhs, const char *rhs);