diff --git a/src/renderer/GridCache.test.ts b/src/browser/renderer/GridCache.test.ts
similarity index 96%
rename from src/renderer/GridCache.test.ts
rename to src/browser/renderer/GridCache.test.ts
index c4b1c220..30d22e81 100644
--- a/src/renderer/GridCache.test.ts
+++ b/src/browser/renderer/GridCache.test.ts
@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { GridCache } from './GridCache';
+import { GridCache } from 'browser/renderer/GridCache';
 
 describe('GridCache', () => {
   let grid: GridCache<number>;
diff --git a/src/renderer/GridCache.ts b/src/browser/renderer/GridCache.ts
similarity index 84%
rename from src/renderer/GridCache.ts
rename to src/browser/renderer/GridCache.ts
index dd188c62..b48798d2 100644
--- a/src/renderer/GridCache.ts
+++ b/src/browser/renderer/GridCache.ts
@@ -4,7 +4,7 @@
  */
 
 export class GridCache<T> {
-  public cache: T[][];
+  public cache: (T | undefined)[][];
 
   public constructor() {
     this.cache = [];
@@ -16,7 +16,7 @@ export class GridCache<T> {
         this.cache.push([]);
       }
       for (let y = this.cache[x].length; y < height; y++) {
-        this.cache[x].push(null);
+        this.cache[x].push(undefined);
       }
       this.cache[x].length = height;
     }
@@ -26,7 +26,7 @@ export class GridCache<T> {
   public clear(): void {
     for (let x = 0; x < this.cache.length; x++) {
       for (let y = 0; y < this.cache[x].length; y++) {
-        this.cache[x][y] = null;
+        this.cache[x][y] = undefined;
       }
     }
   }
diff --git a/src/renderer/TextRenderLayer.ts b/src/renderer/TextRenderLayer.ts
index 9db35b6a..1858f005 100644
--- a/src/renderer/TextRenderLayer.ts
+++ b/src/renderer/TextRenderLayer.ts
@@ -6,7 +6,7 @@
 import { ICharacterJoinerRegistry, IRenderDimensions } from 'browser/renderer/Types';
 import { ITerminal } from '../Types';
 import { CharData, ICellData } from 'common/Types';
-import { GridCache } from './GridCache';
+import { GridCache } from 'browser/renderer/GridCache';
 import { BaseRenderLayer } from './BaseRenderLayer';
 import { AttributeData } from 'common/buffer/AttributeData';
 import { NULL_CELL_CODE, Content } from 'common/buffer/Constants';