2 files changed, 1 insertions, 2 deletions
diff --git a/lib/irb/context.rb b/lib/irb/context.rb
index b74cae1223..a3b7dda8cd 100644
--- a/lib/irb/context.rb
+++ b/lib/irb/context.rb
@@ -32,7 +32,7 @@ module IRB
       else
         @workspace = WorkSpace.new
       end
-      @thread = Thread.current if defined? Thread
+      @thread = Thread.current
 
       # copy of default configuration
       @ap_name = IRB.conf[:AP_NAME]
diff --git a/lib/irb/ext/multi-irb.rb b/lib/irb/ext/multi-irb.rb
index 74de1ecde5..e57d43a569 100644
--- a/lib/irb/ext/multi-irb.rb
+++ b/lib/irb/ext/multi-irb.rb
@@ -9,7 +9,6 @@
 #
 #
 #
-fail CantShiftToMultiIrbMode unless defined?(Thread)
 
 module IRB
   class JobManager