diff --git a/appveyor.yml b/appveyor.yml
index 0fdfca724c6985691e592bd4284b286f7c686672..a1f4366232a733b1b2cecb1cf2c6876fe260f540 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,6 +7,9 @@ init:
 install:
   ps: Bootstrap
 
+environment:
+  NOT_CRAN: "true"
+
 build_script:
   - travis-tool.sh install_deps