diff --git a/artiq-fast/default.nix b/artiq-fast/default.nix
index ae34452..1796cb7 100644
--- a/artiq-fast/default.nix
+++ b/artiq-fast/default.nix
@@ -56,6 +56,14 @@ let
       inherit (openocd) bscan_spi_bitstreams;
     };
     conda-artiq = import ./conda/artiq.nix { inherit pkgs; };
+    conda-asyncserial = import ./conda/build.nix { inherit pkgs; } {
+      name = "conda-asyncserial";
+      src = import ./conda/fake-source.nix { inherit pkgs; } {
+        name = "asyncserial";
+        inherit (pythonDeps.asyncserial) version src;
+        dependencies = ["pyserial"];
+      };
+    };
   };
 in
   mainPackages // boardPackages
diff --git a/artiq-fast/pkgs/python-deps.nix b/artiq-fast/pkgs/python-deps.nix
index b0672c1..31f6147 100644
--- a/artiq-fast/pkgs/python-deps.nix
+++ b/artiq-fast/pkgs/python-deps.nix
@@ -16,6 +16,7 @@ rec {
 
   asyncserial = python3Packages.buildPythonPackage rec {
     name = "asyncserial";
+    version = "0.1";
     src = fetchFromGitHub {
       owner = "m-labs";
       repo = "asyncserial";