diff --git a/circle.yml b/circle.yml
index 7e56091..f35a7ab 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,6 +1,6 @@
 dependencies:
   pre:
-    - sudo apt-get update; sudo apt-get install  mono-devel mono-complete
+    - sudo apt-get update; sudo apt-get install  mono-devel mono-complete -f
 test:
   override:
     - rake preflight