diff --git a/src/indexing/EventIndex.js b/src/indexing/EventIndex.js
index eed9837a7a..02151f8474 100644
--- a/src/indexing/EventIndex.js
+++ b/src/indexing/EventIndex.js
@@ -467,9 +467,6 @@ export default class EventIndex extends EventEmitter {
             // decryption keys, do we want to retry this checkpoint at a later
             // stage?
             const filteredEvents = matrixEvents.filter(this.isValidEvent);
-            const undecryptableEvents = matrixEvents.filter((ev) => {
-                return ev.isDecryptionFailure();
-            });
 
             // Collect the redaction events so we can delete the redacted events
             // from the index.