diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 9ce6a20c3ffa82debd6853a72f02c316ccfb642d..e6c8921091ec1253e5de679bb5ba75187936e0ee 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -19,8 +19,8 @@
 				outputBuf += decoder.decode(buf);
 				const nl = outputBuf.lastIndexOf("\n");
 				if (nl != -1) {
-					console.log(outputBuf.substr(0, nl));
-					outputBuf = outputBuf.substr(nl + 1);
+					console.log(outputBuf.substring(0, nl));
+					outputBuf = outputBuf.substring(nl + 1);
 				}
 				return buf.length;
 			},