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-rw-r--r--lib/drb/unix.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/drb/unix.rb b/lib/drb/unix.rb
index e92a7a88ca..f51e390808 100644
--- a/lib/drb/unix.rb
+++ b/lib/drb/unix.rb
@@ -2,6 +2,8 @@ require 'socket'
require 'drb/drb'
require 'tmpdir'
+raise(LoadError, "UNIXServer is required") unless defined?(UNIXServer)
+
module DRb
class DRbUNIXSocket < DRbTCPSocket