diff --git a/Assets/Scripts/GoogleSignInIOSBuildPatch.cs b/Assets/Scripts/GoogleSignInIOSBuildPatch.cs
index 610c8572..de19d515 100644
--- a/Assets/Scripts/GoogleSignInIOSBuildPatch.cs
+++ b/Assets/Scripts/GoogleSignInIOSBuildPatch.cs
@@ -1,7 +1,5 @@
 #if UNITY_IOS && UNITY_EDITOR
 using UnityEditor;
-using UnityEditor.Build;
-using UnityEditor.Build.Reporting;
 using UnityEditor.Callbacks;
 using UnityEditor.iOS.Xcode;
 using UnityEngine;
@@ -12,7 +10,8 @@ public class GoogleSignInIOSBuildPatch
     [PostProcessBuild(100)]
     public static void OnPostProcessBuild(BuildTarget buildTarget, string pathToBuiltProject)
     {
-        if (buildTarget != BuildTarget.iOS) return;
+        if (buildTarget != BuildTarget.iOS)
+            return;
 
         string plistPath = Path.Combine(pathToBuiltProject, "Info.plist");
 
@@ -21,20 +20,19 @@ public class GoogleSignInIOSBuildPatch
         plist.ReadFromFile(plistPath);
         PlistElementDict rootDict = plist.root;
 
-        // 1. Set GIDClientID
         rootDict.SetString("GIDClientID", GameConstants.iOS_ClientID);
 
-        // 2. Add CFBundleURLSchemes
         PlistElementArray urlTypes = rootDict.CreateArray("CFBundleURLTypes");
         PlistElementDict urlDict = urlTypes.AddDict();
         PlistElementArray schemes = urlDict.CreateArray("CFBundleURLSchemes");
         schemes.AddString(GameConstants.iOS_URL_Scheme);
 
         plist.WriteToFile(plistPath);
-        Debug.Log("✅ Info.plist patched with GIDClientID and CFBundleURLSchemes.");
+        Debug.Log("✅ Patched Info.plist with GIDClientID and URL scheme.");
 
         // === Modify UnityAppController.mm ===
         string appControllerPath = Path.Combine(pathToBuiltProject, "Classes", "UnityAppController.mm");
+
         if (!File.Exists(appControllerPath))
         {
             Debug.LogWarning("⚠️ UnityAppController.mm not found.");
@@ -42,23 +40,37 @@ public class GoogleSignInIOSBuildPatch
         }
 
         string content = File.ReadAllText(appControllerPath);
-        string injection = $"[GIDSignIn sharedInstance].clientID = @\"{GameConstants.iOS_ClientID}\";";
 
+        // 1. Inject #import if missing
+        string importLine = "#import <GoogleSignIn/GoogleSignIn.h>";
+        if (!content.Contains(importLine))
+        {
+            int importInsertIndex = content.IndexOf("#import");
+            if (importInsertIndex >= 0)
+            {
+                int endOfLine = content.IndexOf("\n", importInsertIndex);
+                content = content.Insert(endOfLine + 1, importLine + "\n");
+            }
+        }
+
+        // 2. Inject GIDSignIn client ID line
+        string injection = $"[GIDSignIn sharedInstance].clientID = @\"{GameConstants.iOS_ClientID}\";";
         if (!content.Contains(injection))
         {
             string marker = "didFinishLaunchingWithOptions:(NSDictionary*)launchOptions";
-            int index = content.IndexOf(marker);
-            if (index > -1)
+            int markerIndex = content.IndexOf(marker);
+            if (markerIndex >= 0)
             {
-                int braceIndex = content.IndexOf("{", index);
-                if (braceIndex > -1)
+                int braceIndex = content.IndexOf("{", markerIndex);
+                if (braceIndex >= 0)
                 {
                     content = content.Insert(braceIndex + 1, "\n    " + injection);
-                    File.WriteAllText(appControllerPath, content);
-                    Debug.Log("✅ UnityAppController.mm patched with GIDClientID.");
                 }
             }
         }
+
+        File.WriteAllText(appControllerPath, content);
+        Debug.Log("✅ Patched UnityAppController.mm with GIDSignIn setup.");
     }
 }
 #endif