diff --git a/pkgs/tools/text/xml/xmlstarlet/default.nix b/pkgs/tools/text/xml/xmlstarlet/default.nix
index 111e95c9508d..b5eb08199fc6 100644
--- a/pkgs/tools/text/xml/xmlstarlet/default.nix
+++ b/pkgs/tools/text/xml/xmlstarlet/default.nix
@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchurl
+, fetchpatch
 , autoreconfHook
 , pkg-config
 , libxml2
@@ -20,8 +21,11 @@ stdenv.mkDerivation rec {
   buildInputs = [ libxml2 libxslt ];
 
   patches = [
-    # Fixes an incompatible function pointer error with clang 16.
-    ./fix-incompatible-function-pointer.patch
+    (fetchpatch {
+      name = "0001-Fix-build-with-libxml2-2.12.patch";
+      url = "https://sourceforge.net/p/xmlstar/patches/_discuss/thread/890e29655a/66ca/attachment/0001-Fix-build-with-libxml2-2.12.patch";
+      hash = "sha256-XEk7aFOdrzdec1j2ffERJQbLH0AUNJA52QwA9jf4XWA=";
+    })
   ];
 
   preConfigure = ''
diff --git a/pkgs/tools/text/xml/xmlstarlet/fix-incompatible-function-pointer.patch b/pkgs/tools/text/xml/xmlstarlet/fix-incompatible-function-pointer.patch
deleted file mode 100644
index a0818731c217..000000000000
--- a/pkgs/tools/text/xml/xmlstarlet/fix-incompatible-function-pointer.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- a/src/xml_elem.c	2012-08-12 09:18:59.000000000 -0600
-+++ b/src/xml_elem.c	2023-07-11 13:17:14.220809280 -0600
-@@ -186,7 +186,7 @@
-  * put @name into @data->array[@data->offset]
-  */
- static void
--hash_key_put(void *payload, void *data, xmlChar *name)
-+hash_key_put(void *payload, void *data, const xmlChar *name)
- {
-     ArrayDest *dest = data;
-     dest->array[dest->offset++] = name;