diff --git a/watchdog_debug.theme.inc b/watchdog_debug.theme.inc
index e308934..68f4f08 100644
--- a/watchdog_debug.theme.inc
+++ b/watchdog_debug.theme.inc
@@ -3,7 +3,7 @@
 function theme_watchdog_debug_function($variables) {
   $output = '<span class="function">' . $variables['trace']['function'] . '</span> (';
   if (!empty($variables['trace']['args'])) {
-    $output .= ' <span class="args">' . $variables['trace']['args'] . '</span>';
+    $output .= ' <span class="args">' . gettype($variables['trace']['args']) . '</span>';
   }
   $output .= ' )';
   return $output;