diff --git a/addons/addon-webgl/src/GlyphRenderer.ts b/addons/addon-webgl/src/GlyphRenderer.ts
index 10c9ad72..6b359d4b 100644
--- a/addons/addon-webgl/src/GlyphRenderer.ts
+++ b/addons/addon-webgl/src/GlyphRenderer.ts
@@ -318,8 +318,8 @@ export class GlyphRenderer extends Disposable {
   public handleResize(): void {
     const gl = this._gl;
     gl.useProgram(this._program);
-    gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
-    gl.uniform2f(this._resolutionLocation, gl.canvas.width, gl.canvas.height);
+    gl.viewport(0, 0, this._dimensions.device.canvas.width, this._dimensions.device.canvas.height);
+    gl.uniform2f(this._resolutionLocation, this._dimensions.device.canvas.width, this._dimensions.device.canvas.height);
     this.clear();
   }
 
diff --git a/addons/addon-webgl/src/WebglRenderer.ts b/addons/addon-webgl/src/WebglRenderer.ts
index 5e2eaffc..345437d5 100644
--- a/addons/addon-webgl/src/WebglRenderer.ts
+++ b/addons/addon-webgl/src/WebglRenderer.ts
@@ -622,8 +622,6 @@ export class WebglRenderer extends Disposable implements IRenderer {
     // the change as it's an exact multiple of the cell sizes.
     this._canvas.width = width;
     this._canvas.height = height;
-    // Update the WebGL viewport to match the new canvas dimensions
-    this._gl.viewport(0, 0, width, height);
     // Render synchronously to avoid flicker when the canvas is cleared
     this._onRequestRedraw.fire({ start: 0, end: this._terminal.rows - 1, sync: true });
   }