diff --git a/src/main/java/moe/yushi/authlibinjector/util/IOUtils.java b/src/main/java/moe/yushi/authlibinjector/util/IOUtils.java
index 22c8723..29debd6 100644
--- a/src/main/java/moe/yushi/authlibinjector/util/IOUtils.java
+++ b/src/main/java/moe/yushi/authlibinjector/util/IOUtils.java
@@ -58,7 +58,6 @@ public final class IOUtils {
 		HttpURLConnection conn = createConnection(url, proxy);
 		conn.setRequestMethod(method);
 		conn.setDoOutput(true);
-		conn.setFixedLengthStreamingMode(payload.length);
 		conn.setRequestProperty("Content-Type", contentType);
 		try (OutputStream out = conn.getOutputStream()) {
 			out.write(payload);