diff --git a/pkgs/development/compilers/flutter/update/get-artifact-hashes.nix b/pkgs/development/compilers/flutter/update/get-artifact-hashes.nix.in
similarity index 100%
rename from pkgs/development/compilers/flutter/update/get-artifact-hashes.nix
rename to pkgs/development/compilers/flutter/update/get-artifact-hashes.nix.in
diff --git a/pkgs/development/compilers/flutter/update/get-dart-hashes.nix b/pkgs/development/compilers/flutter/update/get-dart-hashes.nix.in
similarity index 100%
rename from pkgs/development/compilers/flutter/update/get-dart-hashes.nix
rename to pkgs/development/compilers/flutter/update/get-dart-hashes.nix.in
diff --git a/pkgs/development/compilers/flutter/update/get-flutter.nix b/pkgs/development/compilers/flutter/update/get-flutter.nix.in
similarity index 100%
rename from pkgs/development/compilers/flutter/update/get-flutter.nix
rename to pkgs/development/compilers/flutter/update/get-flutter.nix.in
diff --git a/pkgs/development/compilers/flutter/update/get-pubspec-lock.nix b/pkgs/development/compilers/flutter/update/get-pubspec-lock.nix.in
similarity index 100%
rename from pkgs/development/compilers/flutter/update/get-pubspec-lock.nix
rename to pkgs/development/compilers/flutter/update/get-pubspec-lock.nix.in
diff --git a/pkgs/development/compilers/flutter/update/update.py b/pkgs/development/compilers/flutter/update/update.py
index c622487cf9dc..618fae5468e5 100755
--- a/pkgs/development/compilers/flutter/update/update.py
+++ b/pkgs/development/compilers/flutter/update/update.py
@@ -23,7 +23,7 @@ NIXPKGS_ROOT = subprocess.Popen(['git',
 
 
 def load_code(name, **kwargs):
-    with open(f"{NIXPKGS_ROOT}/pkgs/development/compilers/flutter/update/{name}", 'r') as f:
+    with open(f"{NIXPKGS_ROOT}/pkgs/development/compilers/flutter/update/{name}.in", 'r') as f:
         code = f.read()
 
     for (key, value) in kwargs.items():