diff --git a/pkgs/build-support/dotnet/add-nuget-deps/default.nix b/pkgs/build-support/dotnet/add-nuget-deps/default.nix
index bf3df815af8a..fb349679e579 100644
--- a/pkgs/build-support/dotnet/add-nuget-deps/default.nix
+++ b/pkgs/build-support/dotnet/add-nuget-deps/default.nix
@@ -5,6 +5,7 @@
   lib,
   substituteAll,
   nuget-to-nix,
+  nixfmt-rfc-style,
   cacert,
   fetchNupkg,
   callPackage,
@@ -67,6 +68,7 @@ attrs
             isExecutable = true;
             inherit cacert;
             nugetToNix = nuget-to-nix;
+            nixfmt = nixfmt-rfc-style;
           };
 
           defaultDepsFile =
diff --git a/pkgs/build-support/dotnet/add-nuget-deps/fetch-deps.sh b/pkgs/build-support/dotnet/add-nuget-deps/fetch-deps.sh
index af560b96fcd5..4ffba4783677 100644
--- a/pkgs/build-support/dotnet/add-nuget-deps/fetch-deps.sh
+++ b/pkgs/build-support/dotnet/add-nuget-deps/fetch-deps.sh
@@ -7,5 +7,7 @@ genericBuild
     @nugetToNix@/bin/nuget-to-nix "${NUGET_PACKAGES%/}"
 ) > deps.nix
 
+@nixfmt@/bin/nixfmt deps.nix
+
 mv deps.nix "$1"
 echo "Succesfully wrote lockfile to $1"
diff --git a/pkgs/development/compilers/dotnet/stage0.nix b/pkgs/development/compilers/dotnet/stage0.nix
index e8be69d1f038..0a8a2b4a7b5c 100644
--- a/pkgs/development/compilers/dotnet/stage0.nix
+++ b/pkgs/development/compilers/dotnet/stage0.nix
@@ -7,6 +7,7 @@
   nix,
   cacert,
   nuget-to-nix,
+  nixfmt-rfc-style,
   dotnetCorePackages,
   xmlstarlet,
   patchNupkgs,
@@ -94,6 +95,7 @@ let
                   nix
                   cacert
                   nuget-to-nix
+                  nixfmt-rfc-style
                 ];
                 postPatch =
                   old.postPatch or ""
@@ -138,7 +140,10 @@ let
                 --arg list "[ ''${depsFiles[*]} ]" \
                 --argstr baseRid ${targetRid} \
                 --arg otherRids '${lib.generators.toPretty { multiline = false; } otherRids}' \
-                ) > "${toString prebuiltPackages.sourceFile}"
+                ) > deps.nix
+              nixfmt deps.nix
+
+              mv deps.nix "${toString prebuiltPackages.sourceFile}"
               EOF
             '';
         };
diff --git a/pkgs/development/tools/godot/3/mono/make-deps.nix b/pkgs/development/tools/godot/3/mono/make-deps.nix
index 553b125dc635..b654576daced 100644
--- a/pkgs/development/tools/godot/3/mono/make-deps.nix
+++ b/pkgs/development/tools/godot/3/mono/make-deps.nix
@@ -1,9 +1,9 @@
-{ godot3-mono, nuget-to-nix }:
+{ godot3-mono, nuget-to-nix, nixfmt-rfc-style }:
 
 godot3-mono.overrideAttrs (self: base: {
   pname = "godot3-mono-make-deps";
 
-  nativeBuildInputs = base.nativeBuildInputs ++ [ nuget-to-nix ];
+  nativeBuildInputs = base.nativeBuildInputs ++ [ nuget-to-nix nixfmt-rfc-style ];
 
   nugetDeps = null;
   nugetSource = null;
@@ -50,6 +50,7 @@ godot3-mono.overrideAttrs (self: base: {
       nugetRestore modules/mono/editor/GodotTools/GodotTools.sln
 
       nuget-to-nix nugetPackages > "$outdir"/deps.nix
+      nixfmt "$outdir"/deps.nix
     popd > /dev/null
   '';