diff --git a/src/main/java/com/sheepit/client/Client.java b/src/main/java/com/sheepit/client/Client.java
index 38c4311..8bc288d 100644
--- a/src/main/java/com/sheepit/client/Client.java
+++ b/src/main/java/com/sheepit/client/Client.java
@@ -1101,7 +1101,7 @@ import okhttp3.HttpUrl;
 		for (int nb_try = 0; nb_try < max_try; nb_try++) {
 			if (nb_try >= 1) {
 				// sleep before retrying
-				this.log.debug(checkpoint, "Sleep for " + timeToSleep / 1000 + "s before trying to re-upload the frame");
+				this.log.debug(checkpoint, "Sleep for " + timeToSleep / 1000 + "s before trying to re-upload the frame, previous error: "+ confirmJobReturnCode);
 				try {
 					Thread.sleep(timeToSleep);
 				}