diff --git a/pkgs/development/compilers/fpc/default.nix b/pkgs/development/compilers/fpc/default.nix
index 4721cac2783..b2c09d80682 100644
--- a/pkgs/development/compilers/fpc/default.nix
+++ b/pkgs/development/compilers/fpc/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, gawk }:
+{ lib, stdenv, fetchurl, gawk, fetchpatch }:
 
 let startFPC = import ./binary.nix { inherit stdenv fetchurl; }; in
 
@@ -17,7 +17,14 @@ stdenv.mkDerivation rec {
   # Patch paths for linux systems. Other platforms will need their own patches.
   patches = [
     ./mark-paths.patch # mark paths for later substitution in postPatch
-  ];
+  ] ++ lib.optional stdenv.isAarch64 (fetchpatch {
+    # backport upstream patch for aarch64 glibc 2.34
+    url = "https://gitlab.com/freepascal.org/fpc/source/-/commit/a20a7e3497bccf3415bf47ccc55f133eb9d6d6a0.patch";
+    hash = "sha256-xKTBwuOxOwX9KCazQbBNLhMXCqkuJgIFvlXewHY63GM=";
+    stripLen = 1;
+    extraPrefix = "fpcsrc/";
+  });
+
   postPatch = ''
     # substitute the markers set by the mark-paths patch
     substituteInPlace fpcsrc/compiler/systems/t_linux.pas --subst-var-by dynlinker-prefix "${glibc}"