diff --git a/plugins/Misc/plugin.py b/plugins/Misc/plugin.py
index 662fe0edd..1d4c88982 100644
--- a/plugins/Misc/plugin.py
+++ b/plugins/Misc/plugin.py
@@ -310,7 +310,7 @@ class Misc(callbacks.Plugin):
                         .decode('utf8'))
                 version = data['commit']['committer']['date']
                 # Strip the last 'Z':
-                version = ''.join(version.rsplit('Z', 1))
+                version = ''.join(version.rsplit('Z', 1)).replace(':', '-')
                 versions[branch] = version
             newest = _('The newest versions available online are %s.') % \
                     ', '.join([_('%s (in %s)') % (y,x)