Index: /CKEditor/trunk/_source/plugins/indent/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/indent/plugin.js	(revision 5986)
+++ /CKEditor/trunk/_source/plugins/indent/plugin.js	(revision 5987)
@@ -261,5 +261,5 @@
 					if ( isNaN( currentOffset ) )
 						currentOffset = 0;
-					var indentOffset = indentOffset || 40;
+					var indentOffset = editor.config.indentOffset || 40;
 					currentOffset += ( self.name == 'indent' ? 1 : -1 ) * indentOffset;