diff --git a/src/renderer/dom/DomRenderer.ts b/src/renderer/dom/DomRenderer.ts
index c5263282..5b1813b5 100644
--- a/src/renderer/dom/DomRenderer.ts
+++ b/src/renderer/dom/DomRenderer.ts
@@ -105,7 +105,7 @@ export class DomRenderer extends EventEmitter implements IRenderer {
       this._terminal.screenElement.appendChild(this._dimensionsStyleElement);
     }
 
-    let styles =
+    const styles =
         `${this._terminalSelector} .${ROW_CONTAINER_CLASS} span {` +
         ` display: inline-block;` +
         ` height: 100%;` +
diff --git a/src/renderer/dom/DomRendererRowFactory.ts b/src/renderer/dom/DomRendererRowFactory.ts
index b07dddb8..d72629a3 100644
--- a/src/renderer/dom/DomRendererRowFactory.ts
+++ b/src/renderer/dom/DomRendererRowFactory.ts
@@ -23,7 +23,7 @@ export class DomRendererRowFactory {
       const charData = lineData[x];
       const char: string = charData[CHAR_DATA_CHAR_INDEX];
       const attr: number = charData[CHAR_DATA_ATTR_INDEX];
-      let width: number = charData[CHAR_DATA_WIDTH_INDEX];
+      const width: number = charData[CHAR_DATA_WIDTH_INDEX];
 
       // The character to the left is a wide character, drawing is owned by the char at x-1
       if (width === 0) {