diff --git a/lib/spring/server.rb b/lib/spring/server.rb
index 91ea84ea..2cea673e 100644
--- a/lib/spring/server.rb
+++ b/lib/spring/server.rb
@@ -36,7 +36,7 @@ def boot
       Spring.verify_environment
 
       write_pidfile
-      set_pgid unless foreground?
+      set_pgid if foreground?
       ignore_signals unless foreground?
       set_exit_hook
       set_process_title