diff --git a/bin/setup b/bin/setup
index 69bb413cb..8b5dc1a9d 100755
--- a/bin/setup
+++ b/bin/setup
@@ -237,10 +237,10 @@ ensure-ruby-installed() {
       fi
     fi
   elif has-executable rvm; then
-    if ! (rvm list | grep $required_ruby_version'\>' &>/dev/null); then
-      banner "Installing Ruby $required_ruby_version with rvm"
-      rvm install $required_ruby_version
-      rvm use $required_ruby_version
+    if ! (rvm list | grep $REQUIRED_RUBY_VERSION'\>' &>/dev/null); then
+      banner "Installing Ruby $REQUIRED_RUBY_VERSION with rvm"
+      rvm install $REQUIRED_RUBY_VERSION
+      rvm use $REQUIRED_RUBY_VERSION
     fi
   else
     error "You don't seem to have a Ruby manager installed."