diff --git a/src/browser/renderer/dom/DomRendererRowFactory.ts b/src/browser/renderer/dom/DomRendererRowFactory.ts
index d3eb9e8e6b..b6ee7bf170 100644
--- a/src/browser/renderer/dom/DomRendererRowFactory.ts
+++ b/src/browser/renderer/dom/DomRendererRowFactory.ts
@@ -166,7 +166,7 @@ export class DomRendererRowFactory {
       if (cell.isUnderline()) {
         charElement.classList.add(`${UNDERLINE_CLASS}-${cell.extended.underlineStyle}`);
         if (charElement.textContent === ' ') {
-          charElement.innerHTML = ' ';
+          charElement.textContent = '\xa0'; // =  
         }
         if (!cell.isUnderlineColorDefault()) {
           if (cell.isUnderlineColorRGB()) {