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-rw-r--r--lib/rainbows/http_server.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rainbows/http_server.rb b/lib/rainbows/http_server.rb
index 236c379..71ed192 100644
--- a/lib/rainbows/http_server.rb
+++ b/lib/rainbows/http_server.rb
@@ -43,7 +43,7 @@ class Rainbows::HttpServer < Unicorn::HttpServer
 
   def ready_pipe=(v)
     # hacky hook got force Rainbows! to load modules only in workers
-    if @master_pid && @master_pid == Process.ppid
+    if defined?(@master_pid) && @master_pid == Process.ppid
       extend(Rainbows.const_get(@use))
     end
     super