diff --git a/dotfiles/config/taffybar/base.nix b/dotfiles/config/taffybar/base.nix
new file mode 100644
index 00000000..73bebeac
--- /dev/null
+++ b/dotfiles/config/taffybar/base.nix
@@ -0,0 +1,19 @@
+(import ./taffybar/nixpkgs.nix) {
+  overlays = [
+    (import ./taffybar/overlay.nix)
+    (import ../xmonad/overlay.nix)
+    (_: super: {
+      haskellPackages = super.haskellPackages.override (old: {
+        overrides = super.lib.composeExtensions (old.overrides or (_: _: {})) (self: _: {
+          imalison-taffybar =
+            self.callCabal2nix "imalison-taffybar"
+            (
+              super.lib.sourceByRegex ./.
+              ["taffybar.hs" "imalison-taffybar.cabal"]
+            )
+            { };
+        });
+      });
+    })
+  ];
+}
diff --git a/dotfiles/config/taffybar/default.nix b/dotfiles/config/taffybar/default.nix
index 47cd42ca..922dacbd 100644
--- a/dotfiles/config/taffybar/default.nix
+++ b/dotfiles/config/taffybar/default.nix
@@ -1,6 +1 @@
-let
-  pkgs = (import ./taffybar/nixpkgs.nix) { overlays = [
-    (import ./taffybar/overlay.nix) (import ../xmonad/overlay.nix)
-  ]; };
-  source = pkgs.lib.sourceByRegex ./. ["taffybar.hs" "imalison-taffybar.cabal"];
-in pkgs.haskellPackages.callCabal2nix "imalison-taffybar" source { }
+(import ./base.nix).haskellPackages.imalison-taffybar
diff --git a/dotfiles/config/taffybar/shell.nix b/dotfiles/config/taffybar/shell.nix
index 2c511610..b2269493 100644
--- a/dotfiles/config/taffybar/shell.nix
+++ b/dotfiles/config/taffybar/shell.nix
@@ -1,7 +1,7 @@
 let
-  pkgs = (import ./taffybar/nixpkgs.nix) { overlays = [
-    (import ./taffybar/overlay.nix) (import ../xmonad/overlay.nix)
-  ]; };
-  source = pkgs.lib.sourceByRegex ./. ["taffybar.hs" "imalison-taffybar.cabal"];
-  imalison-taffybar = pkgs.haskellPackages.callCabal2nix "imalison-taffybar" source { };
-in pkgs.haskellPackages.shellFor { packages = _: [imalison-taffybar pkgs.haskellPackages.taffybar]; }
+  pkgs = (import ./base.nix);
+in pkgs.haskellPackages.shellFor {
+  packages = _: [
+    pkgs.haskellPackages.imalison-taffybar pkgs.haskellPackages.taffybar
+  ];
+}