diff --git a/purge.inc b/purge.inc
index 9ce2228..57f6a8c 100644
--- a/purge.inc
+++ b/purge.inc
@@ -218,7 +218,7 @@ function purge_logging($purge_request_results) {
         watchdog(
           'purge',
           'The proxy server host %blocking_server is blocking purge requests. Please review the proxy configuration.',
-          array('%blocking_server' => $purge_blocking),
+          array('%blocking_server' => $purge_blocking_server),
           $severity = WATCHDOG_ERROR
         );
       }