diff --git a/artiq-fast/default.nix b/artiq-fast/default.nix
index 5329b71..bd5e15d 100644
--- a/artiq-fast/default.nix
+++ b/artiq-fast/default.nix
@@ -69,6 +69,7 @@ let
         name = "sipyco";
         inherit (pythonDeps.sipyco) version src;
       };
+      dependencies = ["numpy"];
     };
     conda-quamash = import ./conda/build.nix { inherit pkgs; } {
       name = "conda-quamash";