diff --git a/src/client.js b/src/client.js
index 4ba045118..834cc9615 100644
--- a/src/client.js
+++ b/src/client.js
@@ -1475,6 +1475,13 @@ MatrixClient.prototype.prepareKeyBackupVersion = async function(
     };
 };
 
+/**
+ * Check whether the key backup private key is stored in secret storage.
+ */
+MatrixClient.prototype.isKeyBackupKeyStored = async function() {
+    return this.isSecretStored("m.megolm_backup.v1", false /* checkKey */);
+};
+
 /**
  * Create a new key backup version and enable it, using the information return
  * from prepareKeyBackupVersion.