diff --git a/lib/proton.dart b/lib/proton.dart
index 152826c..439e5b2 100644
--- a/lib/proton.dart
+++ b/lib/proton.dart
@@ -42,13 +42,14 @@ class ProtonState extends State<Proton> {
               } else {
                 await dir.create(recursive: true);
               }
-              Platform.environment.putIfAbsent(
-                  "STEAM_COMPAT_CLIENT_INSTALL_PATH", () => "~/.steam");
-              Platform.environment
-                  .putIfAbsent("STEAM_COMPAT_DATA_PATH", () => dir.path);
 
+              Map<String, String> env = Map();
+              env.putIfAbsent(
+                  "STEAM_COMPAT_CLIENT_INSTALL_PATH", () => "~/.steam");
+              env.putIfAbsent("STEAM_COMPAT_DATA_PATH", () => dir.path);
               await Process.run(
-                  "proton", ["run", "this_program_does_not_exist.exe"]);
+                  "proton", ["run", "this_program_does_not_exist.exe"],
+                  environment: env);
             },
           )
         ]),