diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..505e18ab
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1661864979,
+        "narHash": "sha256-ajXYYTE1uoY3ei/P1v+Knklf2QNCBxMtw1gByaPTGU4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a28adc36c20fd2fbaeb06ec9bbd79b6bf7443979",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-22.05",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..aa412577
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,9 @@
+{
+  description = "gcalcli";
+  inputs = { nixpkgs = { url = "nixpkgs/nixos-22.05"; }; };
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+    in { devShells.${system}.default = import ./shell.nix { inherit pkgs; }; };
+}
diff --git a/gcalcli/cli.py b/gcalcli/cli.py
index 99b82dd4..dbb20fcc 100755
--- a/gcalcli/cli.py
+++ b/gcalcli/cli.py
@@ -227,7 +227,7 @@ def main():
         elif parsed_args.command == 'remind':
             gcal.Remind(
                     parsed_args.minutes, parsed_args.cmd,
-                    use_reminders=parsed_args.use_reminders
+                    parsed_args.nodeclined, use_reminders=parsed_args.use_reminders
             )
 
         elif parsed_args.command == 'import':
diff --git a/gcalcli/gcal.py b/gcalcli/gcal.py
index 098357ab..7940af53 100644
--- a/gcalcli/gcal.py
+++ b/gcalcli/gcal.py
@@ -1368,7 +1368,7 @@ def ModifyEvents(self, work, search_text, start=None, end=None,
         return self._iterate_events(
                 self.now, event_list, year_date=True, work=work)
 
-    def Remind(self, minutes, command, use_reminders=False):
+    def Remind(self, minutes, command, nodeclined, use_reminders=False):
         """
         Check for events between now and now+minutes.
 
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 00000000..47a90b2e
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,6 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  python38WithPackages =
+    (pkgs.python38.withPackages (pythonPackages: with pythonPackages; [ tox ]));
+in pkgs.mkShell { buildInputs = [ python38WithPackages ]; }