diff --git a/CHANGES.md b/CHANGES.md
index c49a6f8f5..d5f79da2a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,7 @@
 
 - Bugfix: Don't treat every duplicate message ID as a message correction; since some
   clients don't use globally unique ID's this causes false positives.
+- #1712: `TypeError: plugin._features is not a function`
 
 ## 5.0.3 (2019-09-13)
 
diff --git a/src/headless/converse-disco.js b/src/headless/converse-disco.js
index 6c75121ed..104e74739 100644
--- a/src/headless/converse-disco.js
+++ b/src/headless/converse-disco.js
@@ -321,7 +321,7 @@ converse.plugins.add('converse-disco', {
                 }
                 iqresult.c('identity', attrs).up();
             });
-            plugin._features(feature => iqresult.c('feature', {'var': feature}).up());
+            plugin._features.forEach(feature => iqresult.c('feature', {'var': feature}).up());
             _converse.api.send(iqresult.tree());
             return true;
         }