diff --git a/ansifilter/ansifilter.patch b/ansifilter/ansifilter.patch
index 439195f17e..57a5b82cac 100644
--- a/ansifilter/ansifilter.patch
+++ b/ansifilter/ansifilter.patch
@@ -10,39 +10,3 @@ Index: src/makefile
  
  SOURCES=arg_parser.o stringtools.o cmdlineoptions.o main.o platform_fs.o\
  codegenerator.o htmlgenerator.o pangogenerator.o texgenerator.o latexgenerator.o rtfgenerator.o svggenerator.o\
-Index: src/rtfgenerator.cpp
---- src/rtfgenerator.cpp.orig	2021-01-30 17:20:06.000000000 +0100
-+++ src/rtfgenerator.cpp	2021-02-06 09:31:34.982610000 +0100
-@@ -29,6 +29,14 @@
- #include "rtfgenerator.h"
- #include "stylecolour.h"
- 
-+#include <sstream>
-+
-+template <typename T> std::string my_to_string(const T& n) {
-+    std::ostringstream stm;
-+    stm << n;
-+    return stm.str();
-+}
-+
- namespace ansifilter
- {
- 
-@@ -188,7 +196,7 @@
- 
-     if (!utf8SeqLen){
-       string m ( "\\u" );
--      m += to_string(utf16Char);
-+      m += my_to_string(utf16Char);
-       m += '?';
-       utf16Char=0L;
-       return m;
-@@ -321,7 +329,7 @@
-   std::istringstream iss(hexCode);
- 
-   iss >> std::hex >> x;
--  decCode += to_string(x);
-+  decCode += my_to_string(x);
-   decCode +="?";
- 
-   return decCode;