diff --git a/pkgs/by-name/cv/cvs/package.nix b/pkgs/by-name/cv/cvs/package.nix
index 47c4c2f888c7..f903bc16a74c 100644
--- a/pkgs/by-name/cv/cvs/package.nix
+++ b/pkgs/by-name/cv/cvs/package.nix
@@ -46,6 +46,10 @@ stdenv.mkDerivation {
     texinfo
   ];
 
+  # Fix build with gcc15
+  # https://savannah.nongnu.org/bugs/index.php?66726
+  env.NIX_CFLAGS_COMPILE = "-std=gnu17";
+
   configureFlags = [
     "--with-editor=${nano}/bin/nano"