diff --git a/pkgs/development/lisp-modules-new/ql.nix b/pkgs/development/lisp-modules-new/ql.nix
index 0367d9ec3623..f65a55dae117 100644
--- a/pkgs/development/lisp-modules-new/ql.nix
+++ b/pkgs/development/lisp-modules-new/ql.nix
@@ -147,6 +147,7 @@ let
     };
     classimp = pkg: {
       nativeLibs = [ assimp ];
+      meta.broken = true; # Requires assimp ≤ 5.0.x.
     };
     clsql-postgresql = pkg: {
       nativeLibs = [ postgresql.lib ];