diff --git a/lib/Analog/Logger.php b/lib/Analog/Logger.php
index a7d1b03..b44e3b7 100644
--- a/lib/Analog/Logger.php
+++ b/lib/Analog/Logger.php
@@ -115,7 +115,7 @@ private function interpolate ($message, array $context = array ()) {
 			} elseif (is_object ($val)) {
 				$val = json_encode ($val);
 			} elseif (is_array ($val)) {
-				$val = join (', ', $val);
+				$val = json_encode ($val);
 			} elseif (is_resource ($val)) {
 				$val = (string) $val;
 			}