diff --git a/pkgs/by-name/xz/xzgv/package.nix b/pkgs/by-name/xz/xzgv/package.nix
index 042e5ced098b..4fe8f8cdfa21 100644
--- a/pkgs/by-name/xz/xzgv/package.nix
+++ b/pkgs/by-name/xz/xzgv/package.nix
@@ -23,6 +23,10 @@ stdenv.mkDerivation rec {
     gtk2
     libexif
   ];
+  env.NIX_CFLAGS_COMPILE = toString [
+    # gcc15 build failure
+    "-std=gnu17"
+  ];
   postPatch = ''
     substituteInPlace config.mk \
       --replace /usr/local $out