diff --git a/lib/Reports/AllUsers.php b/lib/Reports/AllUsers.php
index e0b510e..6d18158 100644
--- a/lib/Reports/AllUsers.php
+++ b/lib/Reports/AllUsers.php
@@ -115,7 +115,7 @@ public function printReport(InputInterface $input, OutputInterface $output, Outp
 		$progress->clear();
 
 		foreach ($this->reports as $userId => $report) {
-			$this->printRecord($input, $streamOutput, $userId, $report);
+			$this->printRecord($input, $streamOutput, (string)$userId, $report);
 		}
 	}