diff --git a/firmware_handler.cpp b/firmware_handler.cpp
index f648d42..d446f66 100644
--- a/firmware_handler.cpp
+++ b/firmware_handler.cpp
@@ -597,6 +597,9 @@
         case UpdateState::updatePending:
             item->second->flags |= blobs::StateFlags::committing;
             return triggerUpdate();
+        case UpdateState::updateStarted:
+            /* Calling repeatedly has no effect within an update process. */
+            return true;
         default:
             return false;
     }