diff --git a/backends/twitter/rapidjson/internal/strfunc.h b/backends/twitter/rapidjson/internal/strfunc.h
deleted file mode 100644
index bbf444fe6df2e26d5ba438f2e827c3782c1af831..0000000000000000000000000000000000000000
--- a/backends/twitter/rapidjson/internal/strfunc.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
-#define RAPIDJSON_INTERNAL_STRFUNC_H_
-
-namespace rapidjson {
-namespace internal {
-
-//! Custom strlen() which works on different character types.
-/*!	\tparam Ch Character type (e.g. char, wchar_t, short)
-	\param s Null-terminated input string.
-	\return Number of characters in the string. 
-	\note This has the same semantics as strlen(), the return value is not number of Unicode codepoints.
-*/
-template <typename Ch>
-inline SizeType StrLen(const Ch* s) {
-	const Ch* p = s;
-	while (*p != '\0')
-		++p;
-	return SizeType(p - s);
-}
-
-} // namespace internal
-} // namespace rapidjson
-
-#endif // RAPIDJSON_INTERNAL_STRFUNC_H_