diff --git a/shell.nix b/shell.nix
index 6588b4a..f090023 100644
--- a/shell.nix
+++ b/shell.nix
@@ -23,9 +23,11 @@ in
 # alias print="lp -d EPSON-TM-m30 -o lpi=10 -o cpi=15"
 devshell.mkShell {
   packages = with pkgs; [
-    (python3.withPackages (p: with p; [
-      python-escpos
-      pycups
-    ]))
+    (python3.withPackages (
+      p: with p; [
+        python-escpos
+        pycups
+      ]
+    ))
   ];
 }