diff --git a/src/Terminal.ts b/src/Terminal.ts
index f6b9f6376..6c68f23a0 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -1416,28 +1416,28 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     const modifiers = (ev.shiftKey ? 1 : 0) | (ev.altKey ? 2 : 0) | (ev.ctrlKey ? 4 : 0) | (ev.metaKey ? 8 : 0);
     switch (ev.keyCode) {
       case 0:
-        if (ev.key === "UIKeyInputUpArrow") {
+        if (ev.key === 'UIKeyInputUpArrow') {
           if (this.applicationCursor) {
             result.key = C0.ESC + 'OA';
           } else {
             result.key = C0.ESC + '[A';
           }
         }
-        else if (ev.key === "UIKeyInputLeftArrow") {
+        else if (ev.key === 'UIKeyInputLeftArrow') {
           if (this.applicationCursor) {
             result.key = C0.ESC + 'OD';
           } else {
             result.key = C0.ESC + '[D';
           }
         }
-        else if (ev.key === "UIKeyInputRightArrow") {
+        else if (ev.key === 'UIKeyInputRightArrow') {
           if (this.applicationCursor) {
             result.key = C0.ESC + 'OC';
           } else {
             result.key = C0.ESC + '[C';
           }
         }
-        else if (ev.key === "UIKeyInputDownArrow") {
+        else if (ev.key === 'UIKeyInputDownArrow') {
           if (this.applicationCursor) {
             result.key = C0.ESC + 'OB';
           } else {