1 files changed, 4 insertions, 4 deletions
diff --git a/lib/irb/ext/math-mode.rb b/lib/irb/ext/math-mode.rb
index 067eb1e7fa..01bd24a157 100644
--- a/lib/irb/ext/math-mode.rb
+++ b/lib/irb/ext/math-mode.rb
@@ -28,14 +28,14 @@ module IRB
     # more information.
     def math_mode=(opt)
       if @math_mode == true && !opt
-	IRB.fail CantReturnToNormalMode
-	return
+        IRB.fail CantReturnToNormalMode
+        return
       end
 
       @math_mode = opt
       if math_mode
-	main.extend Math
-	print "start math mode\n" if verbose?
+        main.extend Math
+        print "start math mode\n" if verbose?
       end
     end