diff --git a/IPython/core/debugger.py b/IPython/core/debugger.py
index e0491a9..ad1e9ee 100644
--- a/IPython/core/debugger.py
+++ b/IPython/core/debugger.py
@@ -41,7 +41,6 @@ from IPython.core.excolors import exception_colors
 from IPython.testing.skipdoctest import skip_doctest
 
 
-RGX_EXTRA_INDENT = re.compile('(?<=\n)\s+')
 
 
 prompt = 'ipdb> '
@@ -179,6 +178,9 @@ class Tracer(object):
         self.debugger.set_trace(sys._getframe().f_back)
 
 
+RGX_EXTRA_INDENT = re.compile('(?<=\n)\s+')
+
+
 def strip_indentation(multiline_string):
     return RGX_EXTRA_INDENT.sub('', multiline_string)