diff --git a/selfdrive/controls/lib/lateral_mpc_lib/SConscript b/selfdrive/controls/lib/lateral_mpc_lib/SConscript
index d10cd80f94..38c1df6396 100644
--- a/selfdrive/controls/lib/lateral_mpc_lib/SConscript
+++ b/selfdrive/controls/lib/lateral_mpc_lib/SConscript
@@ -55,7 +55,7 @@ source_list = ['lat_mpc.py',
 ]
 
 lenv = env.Clone()
-acados_rel_path = Dir({gen}).rel_path(Dir(f"#third_party/acados/{arch}/lib"))
+acados_rel_path = Dir(gen).rel_path(Dir(f"#third_party/acados/{arch}/lib"))
 lenv["RPATH"] += [lenv.Literal(f'\\$$ORIGIN/{acados_rel_path}')]
 lenv.Clean(generated_files, Dir(gen))