diff --git a/docs/changelog.md b/docs/changelog.md
index 5c8d8d4..f88b004 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -11,6 +11,7 @@ SPDX-License-Identifier: CC-BY-4.0
 
 #### New Features
 
+- Ported the extension to GNOME 49.
 - Added a color preview widget to the preferences of the Aura Glow effect. Thanks to [@lstrsrt](https://github.com/lstrsrt) for this contribution!
 
 ## [Burn My Windows 46](https://github.com/schneegans/Burn-My-Windows/releases/tag/v46)
diff --git a/metadata.json b/metadata.json
index e72f122..b290da2 100644
--- a/metadata.json
+++ b/metadata.json
@@ -9,7 +9,7 @@
   },
   "gettext-domain": "burn-my-windows",
   "settings-schema": "org.gnome.shell.extensions.burn-my-windows",
-  "shell-version": ["45", "46", "47", "48"],
+  "shell-version": ["45", "46", "47", "48", "49"],
   "url": "https://github.com/Schneegans/Burn-My-Windows",
   "version": 46
 }
diff --git a/src/Shader.js b/src/Shader.js
index fa5ba48..b7a6377 100644
--- a/src/Shader.js
+++ b/src/Shader.js
@@ -132,9 +132,15 @@ export var Shader = GObject.registerClass({
 
     // This is not necessarily symmetric, but I haven't figured out a way to
     // get the actual values...
-    const padding      = (actor.width - actor.meta_window.get_frame_rect().width) / 2;
-    const isFullscreen = actor.meta_window.get_maximized() === Meta.MaximizeFlags.BOTH ||
-      actor.meta_window.fullscreen;
+    const padding    = (actor.width - actor.meta_window.get_frame_rect().width) / 2;
+    let isFullscreen = actor.meta_window.fullscreen;
+
+    // is_maximized has been added in GNOME 49.
+    if (actor.meta_window.is_maximized) {
+      isFullscreen |= actor.meta_window.is_maximized();
+    } else {
+      isFullscreen |= actor.meta_window.get_maximized() === Meta.MaximizeFlags.BOTH;
+    }
 
     this.set_uniform_float(this._uPadding, 1, [padding]);
     this.set_uniform_float(this._uForOpening, 1, [forOpening]);