diff --git a/pkgs/additional/sane-scripts/default.nix b/pkgs/additional/sane-scripts/default.nix
index 3f84627d..1f3088f0 100644
--- a/pkgs/additional/sane-scripts/default.nix
+++ b/pkgs/additional/sane-scripts/default.nix
@@ -69,7 +69,7 @@ let
     deadlines = static-nix-shell.mkBash {
       pname = "sane-deadlines";
       src = ./src;
-      pkgs = [ "coreutils-full" ];
+      pkgs = [ "coreutils-full" "gnused" ];
     };
     dev-cargo-loop = static-nix-shell.mkBash {
       pname = "sane-dev-cargo-loop";
diff --git a/pkgs/additional/sane-scripts/src/sane-deadlines b/pkgs/additional/sane-scripts/src/sane-deadlines
index 34256d50..2736b492 100755
--- a/pkgs/additional/sane-scripts/src/sane-deadlines
+++ b/pkgs/additional/sane-scripts/src/sane-deadlines
@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p coreutils-full
+#!nix-shell -i bash -p coreutils-full -p gnused
 
 # processes a tab-separated "deadlines" file and alerts for any upcoming events.
 #