diff --git a/fastboot/protocol.c b/fastboot/protocol.c
index 10a84c1..5b97600 100644
--- a/fastboot/protocol.c
+++ b/fastboot/protocol.c
@@ -305,7 +305,10 @@
         return -1;
     }
 
-    fb_download_data_sparse_flush(usb);
+    r = fb_download_data_sparse_flush(usb);
+    if (r < 0) {
+        return -1;
+    }
 
     return _command_end(usb);
 }