diff --git a/stack.sh b/stack.sh
index d54a652928..19ab903b5c 100755
--- a/stack.sh
+++ b/stack.sh
@@ -98,6 +98,9 @@ export_proxy_variables
 # Destination path for installation ``DEST``
 DEST=${DEST:-/opt/stack}
 
+# We are going to be installing various packages that need to be
+# world-readable, so ensure our umask isn't too strict.
+umask 022
 
 # Sanity Check
 # ------------