diff --git a/mcu-contrib/default.nix b/mcu-contrib/default.nix
index 901dbc7..cf358de 100644
--- a/mcu-contrib/default.nix
+++ b/mcu-contrib/default.nix
@@ -70,14 +70,14 @@ in
       doCheck = false;
     } // value))) {
       dual-iir = {};
-      dual-iir-pounder_v1_1 = {
+      dual-iir-pounder_v1_0 = {
         binaryName = "dual-iir";
-        extraCargoBuildArgs = "--features pounder_v1_1";
+        extraCargoBuildArgs = "--features pounder_v1_0";
       };
       lockin = {};
-      lockin-pounder_v1_1 = {
+      lockin-pounder_v1_0 = {
         binaryName = "lockin";
-        extraCargoBuildArgs = "--features pounder_v1_1";
+        extraCargoBuildArgs = "--features pounder_v1_0";
       };
     } //
   {