diff --git a/data/cosin.toml b/data/cosin.toml
index 0ac5bbb..aee084e 100644
--- a/data/cosin.toml
+++ b/data/cosin.toml
@@ -58,5 +58,7 @@ streaming_main_url = "https://streaming.cosin.ch"
 irc_server = "ircs://irc.chaostreff.ch:6601/"
 irc_channel = "#cosin"
 
+mastodon_server = "https://chaos.social/"
+mastodon_handle = "@CoSin"
 
 orga_email = "cosin2020@cosin.ch"
diff --git a/layouts/partials/site-sidebar.de.html b/layouts/partials/site-sidebar.de.html
index e307a40..9572469 100644
--- a/layouts/partials/site-sidebar.de.html
+++ b/layouts/partials/site-sidebar.de.html
@@ -65,7 +65,7 @@ Offen bis {{ .cfp_end_date_day }}. {{ i18n .cfp_end_date_month }} {{ .date_year
 <p><strong>IRC:</strong> <a href="{{ .irc_server | safeURL }}{{ .irc_channel }}">{{ .irc_channel }}</a></p>
 
 
-<p><strong>Mastodon:</strong> <a rel="me" href="https://chaos.social/@CoSin">@CoSin</a></p>
+<p><strong>Mastodon:</strong> <a rel="me" href="{{ .mastodon_server | safeURL }}{{ .mastodon_handle }}">{{ .mastodon_handle }}</a></p>
 {{ end }}
 
 
diff --git a/layouts/partials/site-sidebar.en.html b/layouts/partials/site-sidebar.en.html
index 51c2ea7..8b3f07e 100644
--- a/layouts/partials/site-sidebar.en.html
+++ b/layouts/partials/site-sidebar.en.html
@@ -65,7 +65,7 @@ Open until {{ .cfp_end_date_day }}. {{ i18n .cfp_end_date_month }} {{ .date_year
 <p><strong>IRC:</strong> <a href="{{ .irc_server | safeURL }}{{ .irc_channel }}">{{ .irc_channel }}</a></p>
 
 
-<p><strong>Mastodon:</strong> <a rel="me" href="https://chaos.social/@CoSin">@CoSin</a></p>
+<p><strong>Mastodon:</strong> <a rel="me" href="{{ .mastodon_server | safeURL }}{{ .mastodon_handle }}">{{ .mastodon_handle }}</a></p>
 {{ end }}
 
 
diff --git a/layouts/partials/site-sidebar.fr.html b/layouts/partials/site-sidebar.fr.html
index 519a1db..21f0776 100644
--- a/layouts/partials/site-sidebar.fr.html
+++ b/layouts/partials/site-sidebar.fr.html
@@ -65,7 +65,7 @@ Offen bis {{ .cfp_end_date_day }}. {{ i18n .cfp_end_date_month }} {{ .date_year
 <p><strong>IRC:</strong> <a href="{{ .irc_server | safeURL }}{{ .irc_channel }}">{{ .irc_channel }}</a></p>
 
 
-<p><strong>Mastodon:</strong> <a rel="me" href="https://chaos.social/@CoSin">@CoSin</a></p>
+<p><strong>Mastodon:</strong> <a rel="me" href="{{ .mastodon_server | safeURL }}{{ .mastodon_handle }}">{{ .mastodon_handle }}</a></p>
 {{ end }}
 
 
diff --git a/layouts/partials/site-sidebar.it.html b/layouts/partials/site-sidebar.it.html
index 19bcb7f..c7179aa 100644
--- a/layouts/partials/site-sidebar.it.html
+++ b/layouts/partials/site-sidebar.it.html
@@ -65,7 +65,7 @@ Offen bis {{ .cfp_end_date_day }}. {{ i18n .cfp_end_date_month }} {{ .date_year
 <p><strong>IRC:</strong> <a href="{{ .irc_server | safeURL }}{{ .irc_channel }}">{{ .irc_channel }}</a></p>
 
 
-<p><strong>Mastodon:</strong> <a rel="me" href="https://chaos.social/@CoSin">@CoSin</a></p>
+<p><strong>Mastodon:</strong> <a rel="me" href="{{ .mastodon_server | safeURL }}{{ .mastodon_handle }}">{{ .mastodon_handle }}</a></p>
 {{ end }}