diff --git a/discussion/index.md b/discussion/index.md
index 646a222c..51324c03 100644
--- a/discussion/index.md
+++ b/discussion/index.md
@@ -5,6 +5,6 @@ title: Spectrum 2
 
 ### Chat Room
 
-We have a chat room at [spectrum@conference.spectrum.im](xmpp:spectrum@conference.spectrum.im?join). To join it using your browser, [click here](http://slack.spectrum.im/chat). This is the preferred way of
+We have a chat room at [spectrum@conference.spectrum.im](xmpp:spectrum@conference.spectrum.im?join). To join it using your browser, [click here](https://slack.spectrum.im/chat). This is the preferred way of
 contacting the developers. If you ask question there, stay in the room for a while. We have also our own life and we are not paying
 attention to the room 24 hours per day.