diff --git a/.travis.yml b/.travis.yml
index 7aa7f3f79eb4b196bdd73f72cc5ca2e5423606cc..02175de4308de3de0e6b7b8ac89e0fee2de074ff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -63,6 +63,7 @@ addons:
 
   homebrew:
     taps: homebrew/science
+    update: true
     packages:
       - git
       - cmake
diff --git a/test/collision.cpp b/test/collision.cpp
index 2cc491807b305983783b6c6a960aa932c2e9f945..9656f3fe883c29c8cd57467f72a1065f973177cf 100644
--- a/test/collision.cpp
+++ b/test/collision.cpp
@@ -44,6 +44,7 @@
 #include <boost/test/unit_test.hpp>
 #include <boost/utility/binary.hpp>
 
+#include <fstream>
 #include <boost/filesystem.hpp>
 #include <boost/assign/list_of.hpp>