diff --git a/pkgs/misc/vscode-extensions/default.nix b/pkgs/misc/vscode-extensions/default.nix
index 4e7713bdc5f..9d21b057c8a 100644
--- a/pkgs/misc/vscode-extensions/default.nix
+++ b/pkgs/misc/vscode-extensions/default.nix
@@ -1,4 +1,4 @@
-{ config, lib, buildEnv, callPackage, vscode-utils, nodePackages, jdk, llvmPackages_8 }:
+{ config, lib, buildEnv, callPackage, vscode-utils, nodePackages, jdk, llvmPackages_8, nixpkgs-fmt, jq }:
 
 let
   inherit (vscode-utils) buildVscodeMarketplaceExtension;
@@ -99,13 +99,21 @@ let
         };
       };
 
-      B4dM4n.vscode-nixpkgs-fmt = buildVscodeMarketplaceExtension {
+      b4dm4n.vscode-nixpkgs-fmt = buildVscodeMarketplaceExtension {
         mktplcRef = {
           name = "nixpkgs-fmt";
           publisher = "B4dM4n";
           version = "0.0.1";
           sha256 = "sha256-vz2kU36B1xkLci2QwLpl/SBEhfSWltIDJ1r7SorHcr8=";
         };
+        nativeBuildInputs = [ jq ];
+        buildInputs = [ nixpkgs-fmt ];
+        postInstall = ''
+          cd "$out/$installPrefix"
+          tmp_package_json=$(mktemp)
+          jq '.contributes.configuration.properties."nixpkgs-fmt.path".default = "${nixpkgs-fmt}/bin/nixpkgs-fmt"' package.json > "$tmp_package_json"
+          mv "$tmp_package_json" package.json
+        '';
         meta = with lib; {
           license = licenses.mit;
         };