diff --git a/functions b/functions
index be998b1..4953e3a 100644
--- a/functions
+++ b/functions
@@ -7,7 +7,13 @@ prepare_environment() {
   rm -rf puppet-whazz default-config.yaml
   mkdir -p .bundled_gems
   export GEM_HOME=`pwd`/.bundled_gems
-  gem install bundler --no-rdoc --no-ri --verbose
+  ruby <<EOF
+cmd = 'gem install bundler --no-rdoc --no-ri --verbose'
+if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.3.0') then
+  cmd += ' -v 1.17.3'
+end
+system(cmd)
+EOF
 
   # Build fake module
   OS_NEW_MODULE_TEST=yes bash -x ./contrib/bootstrap.sh whazz dummy