diff --git a/src/browser/ScreenDprMonitor.ts b/src/browser/ScreenDprMonitor.ts
deleted file mode 100644
index 1152a55a..00000000
--- a/src/browser/ScreenDprMonitor.ts
+++ /dev/null
@@ -1,74 +0,0 @@
-/**
- * Copyright (c) 2017 The xterm.js authors. All rights reserved.
- * @license MIT
- */
-
-import { EventEmitter } from 'common/EventEmitter';
-import { Disposable, toDisposable } from 'common/Lifecycle';
-
-/**
- * The screen device pixel ratio monitor allows listening for when the
- * window.devicePixelRatio value changes. This is done not with polling but with
- * the use of window.matchMedia to watch media queries. When the event fires,
- * the listener will be reattached using a different media query to ensure that
- * any further changes will register.
- *
- * The listener should fire on both window zoom changes and switching to a
- * monitor with a different DPI.
- */
-export class ScreenDprMonitor extends Disposable {
-  private _currentDevicePixelRatio: number;
-  private _outerListener: ((this: MediaQueryList, ev: MediaQueryListEvent) => any) | undefined;
-  private _resolutionMediaMatchList: MediaQueryList | undefined;
-
-  private readonly _onDprChange = this.register(new EventEmitter<number>());
-  public readonly onDprChange = this._onDprChange.event;
-
-  constructor(private _parentWindow: Window) {
-    super();
-
-    // Initialize listener and dpr value
-    this._outerListener = () => {
-      if (this._parentWindow.devicePixelRatio !== this._currentDevicePixelRatio) {
-        this._onDprChange.fire(this._parentWindow.devicePixelRatio);
-      }
-      this._updateDpr();
-    };
-    this._currentDevicePixelRatio = this._parentWindow.devicePixelRatio;
-    this._updateDpr();
-
-    // Setup additional disposables
-    this.register(toDisposable(() => this.clearListener()));
-  }
-
-  public setWindow(parentWindow: Window): void {
-    this._parentWindow = parentWindow;
-    if (this._parentWindow.devicePixelRatio !== this._currentDevicePixelRatio) {
-      this._onDprChange.fire(this._parentWindow.devicePixelRatio);
-    }
-    this._updateDpr();
-  }
-
-  private _updateDpr(): void {
-    if (!this._outerListener) {
-      return;
-    }
-
-    // Clear listeners for old DPR
-    this._resolutionMediaMatchList?.removeListener(this._outerListener);
-
-    // Add listeners for new DPR
-    this._currentDevicePixelRatio = this._parentWindow.devicePixelRatio;
-    this._resolutionMediaMatchList = this._parentWindow.matchMedia(`screen and (resolution: ${this._parentWindow.devicePixelRatio}dppx)`);
-    this._resolutionMediaMatchList.addListener(this._outerListener);
-  }
-
-  public clearListener(): void {
-    if (!this._resolutionMediaMatchList || !this._outerListener) {
-      return;
-    }
-    this._resolutionMediaMatchList.removeListener(this._outerListener);
-    this._resolutionMediaMatchList = undefined;
-    this._outerListener = undefined;
-  }
-}
diff --git a/src/browser/services/CoreBrowserService.ts b/src/browser/services/CoreBrowserService.ts
index 8a189315..dfd3474d 100644
--- a/src/browser/services/CoreBrowserService.ts
+++ b/src/browser/services/CoreBrowserService.ts
@@ -3,10 +3,9 @@
  * @license MIT
  */
 
-import { Disposable } from 'common/Lifecycle';
+import { Disposable, toDisposable } from 'common/Lifecycle';
 import { ICoreBrowserService } from './Services';
 import { EventEmitter, forwardEvent } from 'common/EventEmitter';
-import { ScreenDprMonitor } from 'browser/ScreenDprMonitor';
 
 export class CoreBrowserService extends Disposable implements ICoreBrowserService {
   public serviceBrand: undefined;
@@ -57,3 +56,71 @@ export class CoreBrowserService extends Disposable implements ICoreBrowserServic
     return this._cachedIsFocused;
   }
 }
+
+
+/**
+ * The screen device pixel ratio monitor allows listening for when the
+ * window.devicePixelRatio value changes. This is done not with polling but with
+ * the use of window.matchMedia to watch media queries. When the event fires,
+ * the listener will be reattached using a different media query to ensure that
+ * any further changes will register.
+ *
+ * The listener should fire on both window zoom changes and switching to a
+ * monitor with a different DPI.
+ */
+class ScreenDprMonitor extends Disposable {
+  private _currentDevicePixelRatio: number;
+  private _outerListener: ((this: MediaQueryList, ev: MediaQueryListEvent) => any) | undefined;
+  private _resolutionMediaMatchList: MediaQueryList | undefined;
+
+  private readonly _onDprChange = this.register(new EventEmitter<number>());
+  public readonly onDprChange = this._onDprChange.event;
+
+  constructor(private _parentWindow: Window) {
+    super();
+
+    // Initialize listener and dpr value
+    this._outerListener = () => {
+      if (this._parentWindow.devicePixelRatio !== this._currentDevicePixelRatio) {
+        this._onDprChange.fire(this._parentWindow.devicePixelRatio);
+      }
+      this._updateDpr();
+    };
+    this._currentDevicePixelRatio = this._parentWindow.devicePixelRatio;
+    this._updateDpr();
+
+    // Setup additional disposables
+    this.register(toDisposable(() => this.clearListener()));
+  }
+
+  public setWindow(parentWindow: Window): void {
+    this._parentWindow = parentWindow;
+    if (this._parentWindow.devicePixelRatio !== this._currentDevicePixelRatio) {
+      this._onDprChange.fire(this._parentWindow.devicePixelRatio);
+    }
+    this._updateDpr();
+  }
+
+  private _updateDpr(): void {
+    if (!this._outerListener) {
+      return;
+    }
+
+    // Clear listeners for old DPR
+    this._resolutionMediaMatchList?.removeListener(this._outerListener);
+
+    // Add listeners for new DPR
+    this._currentDevicePixelRatio = this._parentWindow.devicePixelRatio;
+    this._resolutionMediaMatchList = this._parentWindow.matchMedia(`screen and (resolution: ${this._parentWindow.devicePixelRatio}dppx)`);
+    this._resolutionMediaMatchList.addListener(this._outerListener);
+  }
+
+  public clearListener(): void {
+    if (!this._resolutionMediaMatchList || !this._outerListener) {
+      return;
+    }
+    this._resolutionMediaMatchList.removeListener(this._outerListener);
+    this._resolutionMediaMatchList = undefined;
+    this._outerListener = undefined;
+  }
+}