Index: build/chrome/ssh-agent.js
==================================================================
--- build/chrome/ssh-agent.js
+++ build/chrome/ssh-agent.js
@@ -91,11 +91,15 @@
 				bigInt = bigInt >> 8;
 			}
 			result.reverse();
 			break;
 		case "object":
-			result = Array.from(new Uint8Array(bigInt.toByteArray()));
+			if (bigInt.toByteArray) {
+				result = Array.from(new Uint8Array(bigInt.toByteArray()));
+			} else {
+				result = Array.from(bigInt);
+			}
 			break;
 	}
 
 	result = cackeySSHAgentEncodeLV(result);