diff --git a/src/CompositionHelper.test.ts b/src/CompositionHelper.test.ts
index 053a0c29..156f5a44 100644
--- a/src/CompositionHelper.test.ts
+++ b/src/CompositionHelper.test.ts
@@ -6,6 +6,7 @@
 import { assert } from 'chai';
 import { CompositionHelper } from './CompositionHelper';
 import { ITerminal } from './Types';
+import { MockCharSizeService } from 'TestUtils.test';
 
 describe('CompositionHelper', () => {
   let terminal: ITerminal;
@@ -48,16 +49,12 @@ describe('CompositionHelper', () => {
       buffer: {
         isCursorInViewport: true
       },
-      charMeasure: {
-        height: 10,
-        width: 10
-      },
       options: {
         lineHeight: 1
       }
     } as any;
     handledText = '';
-    compositionHelper = new CompositionHelper(textarea, compositionView, terminal);
+    compositionHelper = new CompositionHelper(textarea, compositionView, terminal, new MockCharSizeService(10, 10));
   });
 
   describe('Input', () => {
diff --git a/src/CompositionHelper.ts b/src/CompositionHelper.ts
index 840bef55..e1179fed 100644
--- a/src/CompositionHelper.ts
+++ b/src/CompositionHelper.ts
@@ -4,6 +4,7 @@
  */
 
 import { ITerminal } from './Types';
+import { ICharSizeService } from 'ui/services/Services';
 
 interface IPosition {
   start: number;
@@ -42,7 +43,8 @@ export class CompositionHelper {
   constructor(
     private _textarea: HTMLTextAreaElement,
     private _compositionView: HTMLElement,
-    private _terminal: ITerminal
+    private _terminal: ITerminal,
+    private _charSizeService: ICharSizeService
   ) {
     this._isComposing = false;
     this._isSendingComposition = false;
@@ -195,9 +197,9 @@ export class CompositionHelper {
     }
 
     if (this._terminal.buffer.isCursorInViewport) {
-      const cellHeight = Math.ceil(this._terminal.charMeasure.height * this._terminal.options.lineHeight);
+      const cellHeight = Math.ceil(this._charSizeService.height * this._terminal.options.lineHeight);
       const cursorTop = this._terminal.buffer.y * cellHeight;
-      const cursorLeft = this._terminal.buffer.x * this._terminal.charMeasure.width;
+      const cursorLeft = this._terminal.buffer.x * this._charSizeService.width;
 
       this._compositionView.style.left = cursorLeft + 'px';
       this._compositionView.style.top = cursorTop + 'px';
diff --git a/src/MouseHelper.test.ts b/src/MouseHelper.test.ts
index 7ca165e8..946b3cb8 100644
--- a/src/MouseHelper.test.ts
+++ b/src/MouseHelper.test.ts
@@ -22,12 +22,6 @@ describe('MouseHelper.getCoords', () => {
     mouseHelper = new MouseHelper(renderer as any, new MockCharSizeService(CHAR_WIDTH, CHAR_HEIGHT));
   });
 
-  describe('when charMeasure is not initialized', () => {
-    it('should return null', () => {
-      assert.equal(mouseHelper.getCoords({ clientX: 0, clientY: 0 }, document.createElement('div'), 10, 10), null);
-    });
-  });
-
   it('should return the cell that was clicked', () => {
     let coords: [number, number];
     coords = mouseHelper.getCoords({ clientX: CHAR_WIDTH / 2, clientY: CHAR_HEIGHT / 2 }, document.createElement('div'), 10, 10);
diff --git a/src/MouseHelper.ts b/src/MouseHelper.ts
index 091d00ae..d5662ab0 100644
--- a/src/MouseHelper.ts
+++ b/src/MouseHelper.ts
@@ -25,7 +25,6 @@ export class MouseHelper implements IMouseHelper {
    * little faster and this function is used in some low level code.
    * @param event The mouse event.
    * @param element The terminal's container element.
-   * @param charMeasure The char measure object used to determine character sizes.
    * @param colCount The number of columns in the terminal.
    * @param rowCount The number of rows n the terminal.
    * @param isSelection Whether the request is for the selection or not. This will
@@ -61,7 +60,6 @@ export class MouseHelper implements IMouseHelper {
    * as expected by xterm.
    * @param event The mouse event.
    * @param element The terminal's container element.
-   * @param charMeasure The char measure object used to determine character sizes.
    * @param colCount The number of columns in the terminal.
    * @param rowCount The number of rows in the terminal.
    */
diff --git a/src/Terminal.ts b/src/Terminal.ts
index f68d3105..1f010382 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -614,14 +614,14 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
     this.register(addDisposableDomListener(this.textarea, 'blur', () => this._onTextAreaBlur()));
     this._helperContainer.appendChild(this.textarea);
 
-    this._compositionView = document.createElement('div');
-    this._compositionView.classList.add('composition-view');
-    this._compositionHelper = new CompositionHelper(this.textarea, this._compositionView, this);
-    this._helperContainer.appendChild(this._compositionView);
-
     this.charMeasure = new CharMeasure(document, this._helperContainer);
     this._charSizeService = new CharSizeService(this._document, this._helperContainer, this.optionsService);
 
+    this._compositionView = document.createElement('div');
+    this._compositionView.classList.add('composition-view');
+    this._compositionHelper = new CompositionHelper(this.textarea, this._compositionView, this, this._charSizeService);
+    this._helperContainer.appendChild(this._compositionView);
+
     // Performance: Add viewport and helper elements from the fragment
     this.element.appendChild(fragment);