only fails on OSX

Author: dsyme

.travis.yml

@@ -16,10 +16,11 @@ script:
   - ./build.sh NuGet
 
 # See bug "https://bugzilla.xamarin.com/show_bug.cgi?id=41914"
-# peverify failing on Mono latest with "condition `res != EINVAL' not met"
+# peverify failing on Mono latest with "condition `res != EINVAL' not met", on OSX
 
 matrix:
   allow_failures:
-    - mono: latest
+    - os: osx
+      mono: latest