diff --git a/src/utils/TestUtils.test.ts b/src/utils/TestUtils.test.ts
index f4bad7173..763eb3e61 100644
--- a/src/utils/TestUtils.test.ts
+++ b/src/utils/TestUtils.test.ts
@@ -182,6 +182,7 @@ export class MockInputHandlingTerminal implements IInputHandlingTerminal {
   wraparoundMode: boolean;
   bracketedPasteMode: boolean;
   curAttr: number;
+  savedCurAttr: number;
   savedCols: number;
   x10Mouse: boolean;
   vt200Mouse: boolean;