diff --git a/pkgs/by-name/cp/cpio/package.nix b/pkgs/by-name/cp/cpio/package.nix
index 879b52a98c7d..d2b2ed66fa1d 100644
--- a/pkgs/by-name/cp/cpio/package.nix
+++ b/pkgs/by-name/cp/cpio/package.nix
@@ -24,6 +24,12 @@ stdenv.mkDerivation rec {
 
   separateDebugInfo = true;
 
+  # The code won't compile in c23 mode.
+  # https://gcc.gnu.org/gcc-15/porting_to.html#c23-fn-decls-without-parameters
+  configureFlags = [
+    "CFLAGS=-std=gnu17"
+  ];
+
   preConfigure = lib.optionalString stdenv.hostPlatform.isCygwin ''
     sed -i gnu/fpending.h -e 's,include <stdio_ext.h>,,'
   '';