diff --git a/py/apigen/tracer/description.py b/py/apigen/tracer/description.py
index 1e4c86c51..076a4b188 100644
--- a/py/apigen/tracer/description.py
+++ b/py/apigen/tracer/description.py
@@ -1,6 +1,7 @@
 
 import py
 from py.__.apigen.tracer import model
+from py.__.code.source import getsource
 
 import types
 import inspect
@@ -18,20 +19,7 @@ class CallFrame(object):
         self.filename = frame.code.raw.co_filename
         self.lineno = frame.lineno
         self.firstlineno = frame.code.firstlineno
-
-        fname = frame.code.raw.co_filename
-        if fname == '<string>':
-            self.source = ''
-        elif hasattr(fname, '__source__'):
-            # is a py.code.Source object
-            self.source = str(fname.__source__)
-            # XXX should we do this?
-            # self.filename = fname.split('<')[1].split('>')[0]
-        else:
-            try:
-                self.source = frame.code.source()
-            except IOError:
-                raise IOError(self.filename)
+        self.source = getsource(frame.code.raw)
 
     def _getval(self):
         return (self.filename, self.lineno)