diff --git a/ChangeLog b/ChangeLog
index f2c9270b087130052b124a6085715768ef97f657..faf06dd56ad79ba22ae4474cd5ccf51efcd2f5bb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,8 @@ version 1.0 -- UNRELEASED
 	mysql:
 	 . Use --skip-events when backing up the performance_schema database.
 	   (Closes: #673572)
+    backupninja changes
+	 . Make it clear what lockfile could not be acquired, if any.
 
 version 1.0-rc1 -- May 15, 2012
     handler changes
diff --git a/src/backupninja.in b/src/backupninja.in
index 040082844ee0dbbc17888c1d23496af8d130a11f..0f74906d843b147009a4d20c44ec0601fc5c2bad 100755
--- a/src/backupninja.in
+++ b/src/backupninja.in
@@ -349,7 +349,7 @@ function process_action() {
 
        else
 	   # a backup is probably ongoing already, so display an error message
-	   debug "failed to acquire lock"
+	   debug "failed to acquire lock $lockfile"
 	   echo "Fatal: Could not acquire lock $lockfile. A backup is probably already running for $file." >>$bufferfile
        fi
    } 200> $lockfile