diff --git a/lib/spring/configuration.rb b/lib/spring/configuration.rb
index eba8e9a7..d880cc2a 100644
--- a/lib/spring/configuration.rb
+++ b/lib/spring/configuration.rb
@@ -1,4 +1,5 @@
 require "spring/errors"
+require "bundler"
 
 module Spring
   class << self