diff --git a/devices/org.osbuild.loopback b/devices/org.osbuild.loopback
index 9415103e..db1b7abd 100755
--- a/devices/org.osbuild.loopback
+++ b/devices/org.osbuild.loopback
@@ -123,7 +123,7 @@ class LoopbackService(devices.DeviceService):
             # seems to be required when clearing the fd of the
             # loop device (as of kernel 5.13.8) or otherwise
             # it leads to data loss.
-            self.lo.flushbuf()
+            self.lo.flush_buf()
 
             # clear the fd. Since it might not immediately be
             # cleared (due to a race with udev or some other