diff --git a/gir.js b/gir.js
index c88d94a..d26d7d6 100644
--- a/gir.js
+++ b/gir.js
@@ -744,7 +744,7 @@ function runVM(state, maxCycles = null) {
 
 			case writeInt:
 				let outputStr = readMemory(index).toString();
-				output = output.concat(encodeUTF8(outputStr));
+				output.push(...encodeUTF8(outputStr))
 				ip++;
 				break;