diff --git a/pkgs/development/lisp-modules/import/main.lisp b/pkgs/development/lisp-modules/import/main.lisp
index 2ab754d05a4c..6671b8f22b4f 100644
--- a/pkgs/development/lisp-modules/import/main.lisp
+++ b/pkgs/development/lisp-modules/import/main.lisp
@@ -48,8 +48,12 @@
   (format t "Dumped nix file to ~a~%"
           (truename "imported.nix")))
 
+(defun run-nix-formatter ()
+  (uiop:run-program '("nixfmt" "imported.nix")))
+
 (defun main ()
   (format t "~%")
   (init-quicklisp)
   (run-importers)
-  (gen-nix-file))
+  (gen-nix-file)
+  (run-nix-formatter))
diff --git a/pkgs/development/lisp-modules/shell.nix b/pkgs/development/lisp-modules/shell.nix
index 85b79bcbff6f..811e8d3c1d28 100644
--- a/pkgs/development/lisp-modules/shell.nix
+++ b/pkgs/development/lisp-modules/shell.nix
@@ -1,18 +1,23 @@
 let
   pkgs = import ../../../. { };
+  inherit (pkgs) mkShellNoCC sbcl nixfmt-rfc-style;
 in
-pkgs.mkShell {
-  nativeBuildInputs = [
-    (pkgs.sbcl.withPackages (
-      ps: with ps; [
-        alexandria
-        str
-        dexador
-        cl-ppcre
-        sqlite
-        arrow-macros
-        jzon
-      ]
+mkShellNoCC {
+  packages = [
+    nixfmt-rfc-style
+    (sbcl.withPackages (
+      ps:
+      builtins.attrValues {
+        inherit (ps)
+          alexandria
+          str
+          dexador
+          cl-ppcre
+          sqlite
+          arrow-macros
+          jzon
+          ;
+      }
     ))
   ];
 }