diff --git a/will/backends/io_adapters/slack.py b/will/backends/io_adapters/slack.py
index <HASH>..<HASH> 100644
--- a/will/backends/io_adapters/slack.py
+++ b/will/backends/io_adapters/slack.py
@@ -353,7 +353,7 @@ class SlackBackend(IOBackend, SleepMixin, StorageMixin):
         })
         if hasattr(event, "kwargs") and "html" in event.kwargs and event.kwargs["html"]:
             data.update({
-                "parse": "full",
+                "parse": "none",
             })
 
         headers = {'Accept': 'text/plain'}
Change parse option from full to none in Slack, this will not format html messages