diff --git a/src/Monolog/Handler/SlackHandler.php b/src/Monolog/Handler/SlackHandler.php
index f1234e43..6f671ac1 100644
--- a/src/Monolog/Handler/SlackHandler.php
+++ b/src/Monolog/Handler/SlackHandler.php
@@ -63,8 +63,7 @@ class SlackHandler extends SocketHandler
             $iconEmoji,
             $useShortAttachment,
             $includeContextAndExtra,
-            $excludeFields,
-            $this->formatter
+            $excludeFields
         );
 
         $this->token = $token;
diff --git a/src/Monolog/Handler/SlackWebhookHandler.php b/src/Monolog/Handler/SlackWebhookHandler.php
index c93c3a02..7576cacb 100644
--- a/src/Monolog/Handler/SlackWebhookHandler.php
+++ b/src/Monolog/Handler/SlackWebhookHandler.php
@@ -60,8 +60,7 @@ class SlackWebhookHandler extends AbstractProcessingHandler
             $iconEmoji,
             $useShortAttachment,
             $includeContextAndExtra,
-            $excludeFields,
-            $this->formatter
+            $excludeFields
         );
     }