diff --git a/demo/client/components/window/optionsWindow.ts b/demo/client/components/window/optionsWindow.ts
index 0096d2ce..d084784f 100644
--- a/demo/client/components/window/optionsWindow.ts
+++ b/demo/client/components/window/optionsWindow.ts
@@ -226,6 +226,9 @@ export class OptionsWindow extends BaseWindow implements IControlWindow {
         if (o === 'theme') {
           this._handlers.updateTerminalContainerBackground();
         }
+        if (o === 'fontFamily') {
+          this._handlers.updateTerminalSize();
+        }
       });
     });
   }