diff --git a/firmware_handler.cpp b/firmware_handler.cpp
index 03342aa..64279a2 100644
--- a/firmware_handler.cpp
+++ b/firmware_handler.cpp
@@ -678,7 +678,11 @@
              * uninteresting. */
             break;
         case UpdateState::updateStarted:
-            /* TODO: handle closing while update is running!. */
+            /* Abort without checking to see if it happened to finish. Require
+             * the caller to stat() deliberately.
+             */
+            abortUpdate();
+            abortProcess();
             break;
         case UpdateState::updateCompleted:
             if (lastUpdateStatus == ActionStatus::failed)
@@ -754,6 +758,11 @@
     return result;
 }
 
+void FirmwareBlobHandler::abortUpdate()
+{
+    update->abort();
+}
+
 bool FirmwareBlobHandler::triggerUpdate()
 {
     bool result = update->trigger();