diff --git a/macosx-setup.sh b/macosx-setup.sh
index 3f304ebf1a..9beff19be2 100755
--- a/macosx-setup.sh
+++ b/macosx-setup.sh
@@ -794,7 +794,7 @@ if [ -n "$CMAKE" -a ! -f cmake-$CMAKE_VERSION-done ]; then
   [ -f cmake-$CMAKE_VERSION-Darwin64-universal.dmg ] || curl -O http://www.cmake.org/files/v$cmake_dir/cmake-$CMAKE_VERSION-Darwin64-universal.dmg || exit 1
   sudo hdiutil attach http://www.cmake.org/files/v2.8/cmake-$CMAKE_VERSION-Darwin64-universal.dmg || exit 1
   sudo installer -target / -pkg /Volumes/cmake-$CMAKE_VERSION-Darwin64-universal/cmake-$CMAKE_VERSION-Darwin64-universal.pkg || exit 1
-  sudo hdiutil detach /Volumes/cmake-$CMAKE_VERSION-Darwin64-universal || exit 1
+  sudo hdiutil detach /Volumes/cmake-$CMAKE_VERSION-Darwin64-universal
   touch cmake-$CMAKE_VERSION-done
 fi