diff --git a/pkgs/by-name/li/libpst/package.nix b/pkgs/by-name/li/libpst/package.nix
index e8f4837dc1d1..c759994252b4 100644
--- a/pkgs/by-name/li/libpst/package.nix
+++ b/pkgs/by-name/li/libpst/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchurl,
+  fetchpatch,
   autoreconfHook,
   bzip2,
   doxygen,
@@ -21,6 +22,14 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-PSkb7rvbSNK5NGCLwGGVtkHaY9Ko9eDThvLp1tBaC0I=";
   };
 
+  patches = [
+    # readpst: Fix a build with gcc/C23 standard
+    (fetchpatch {
+      url = "https://github.com/pst-format/libpst/commit/cc600ee98c4ed23b8ab0bc2cf6b6c6e9cb587e89.patch";
+      hash = "sha256-lD6vJrRbqnlG69+aU0v32UTxD0NfKNr6vPcysXK7ir0=";
+    })
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
     doxygen