diff --git a/appveyor.yml b/appveyor.yml
index 72d61d3622..2c5a9e202f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,7 +4,7 @@ for:
   -
     matrix:
       only:
-        - image: Ubuntu
+        - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu
     cache:
      - '/home/appveyor/miniconda' # need this only on Linux
      - '/home/appveyor/.cache/pip/wheels/'