diff --git a/appveyor.yml b/appveyor.yml
index 9b20f3b..30a8125 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -65,7 +65,7 @@ for:
 -
   matrix:
     only:
-      - image: macOS
+      - image: macOS-Mojave
 
   install:
       - brew install lmdb imagemagick boost