diff --git a/appveyor.yml b/appveyor.yml
index daa1d4e48f..5aa3798b16 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -52,7 +52,7 @@ build_script:
   - nimble install zip -y
   - nimble install opengl
   - nimble install sdl1
-  - nimble install jester@#head
+  - nimble install jester@#head -y
   - nimble install niminst
   - nim c --taintMode:on -d:nimCoroutines tests/testament/tester