diff --git a/src/vs/base/browser/dom.ts b/src/vs/base/browser/dom.ts
index 283b8c82130..da960104877 100644
--- a/src/vs/base/browser/dom.ts
+++ b/src/vs/base/browser/dom.ts
@@ -1400,7 +1400,12 @@ function toBinary(str: string): string {
 	for (let i = 0; i < codeUnits.length; i++) {
 		codeUnits[i] = str.charCodeAt(i);
 	}
-	return String.fromCharCode(...new Uint8Array(codeUnits.buffer));
+	let binary = '';
+	const uint8array = new Uint8Array(codeUnits.buffer);
+	for (let i = 0; i < uint8array.length; i++) {
+	    	binary += String.fromCharCode(uint8array[i]);
+	}
+	return binary;
 }
 
 /**