diff --git a/appveyor.yml b/appveyor.yml
index 4e23490a..4bf0a18f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,6 @@
 environment:
+  # workaround an appveyor bug on macos 
+  # see https://github.com/appveyor/ci/issues/3376#issuecomment-611314299
   APPVEYOR_CONSOLE_DISABLE_PTY: true
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu
@@ -8,10 +10,6 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: macos-mojave
       APPVEYOR_JOB_NAME: "python37-x64-macos-mojave"
 
-matrix:
-  allow_failures:
-    - APPVEYOR_BUILD_WORKER_IMAGE: macos-mojave
-
 stack: python 3.7
 
 build: off