diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index adc91704..e2903c1d 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -22,7 +22,7 @@ jobs:
             rid: linux-x64
           - os: windows-2022
             rid: win-x64
-          - os: macos-14
+          - os: macos-26
             rid: osx-arm64
 
     env:
diff --git a/src/ElectronNET.API/API/Entities/BrowserWindowOptions.cs b/src/ElectronNET.API/API/Entities/BrowserWindowOptions.cs
index 9b1e1fd8..592cea08 100644
--- a/src/ElectronNET.API/API/Entities/BrowserWindowOptions.cs
+++ b/src/ElectronNET.API/API/Entities/BrowserWindowOptions.cs
@@ -115,10 +115,11 @@ public class BrowserWindowOptions
 
         /// <summary>
         /// Whether the window can be put into fullscreen mode. On macOS, also whether the
-        /// maximize/zoom button should toggle full screen mode or maximize window.Default
-        /// is true.
+        /// maximize/zoom button should toggle full screen mode or maximize window. Default
+        /// is true (Electron default).
         /// </summary>
-        public bool Fullscreenable { get; set; }
+        [DefaultValue(true)]
+        public bool Fullscreenable { get; set; } = true; // FIX: previously defaulted to false in C#
 
         /// <summary>
         /// Whether to show the window in taskbar. Default is false.