diff --git a/lenovo/thinkpad/t420/default.nix b/lenovo/thinkpad/t420/default.nix
index 11cc1cc..be05d1e 100644
--- a/lenovo/thinkpad/t420/default.nix
+++ b/lenovo/thinkpad/t420/default.nix
@@ -3,6 +3,7 @@
 {
   imports = [
     ../.
+    ../tp-smapi.nix
     ../../../common/cpu/intel/sandy-bridge
     ../../../common/pc/laptop/acpi_call.nix
   ];