diff --git a/src/ESP32FS.java b/src/ESP32FS.java
index e7d70a1..e1bb586 100644
--- a/src/ESP32FS.java
+++ b/src/ESP32FS.java
@@ -96,10 +96,10 @@ private int listenOnProcess(String[] arguments){
             Runtime rt = Runtime.getRuntime();
             Process proc = rt.exec(arguments);
             // any error message?
-            StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "E");
+            StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "_");
 
             // any output?
-            StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "O");
+            StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "-");
 
             // kick them off
             errorGobbler.start();