diff --git a/quadratic-client/src/app/gridGL/cells/borders/Borders.ts b/quadratic-client/src/app/gridGL/cells/borders/Borders.ts
index 066e0d0a92..63bd8592be 100644
--- a/quadratic-client/src/app/gridGL/cells/borders/Borders.ts
+++ b/quadratic-client/src/app/gridGL/cells/borders/Borders.ts
@@ -177,6 +177,8 @@ export class Borders extends Container {
     this.cellLines.removeChildren();
     this.sheetLines.removeChildren();
 
+    pixiApp.viewport.dirty = true;
+
     const borders = this.borders;
     if (!borders) return;