diff --git a/src/device.c b/src/device.c
index 0fa4e7e..2aa6289 100644
--- a/src/device.c
+++ b/src/device.c
@@ -315,6 +315,10 @@ dc_device_close (dc_device_t *device)
 	if (device->vtable->close == NULL)
 		return DC_STATUS_UNSUPPORTED;
 
+	// Disable the cancellation callback.
+	device->cancel_callback = NULL;
+	device->cancel_userdata = NULL;
+
 	return device->vtable->close (device);
 }