diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 942c98d..8beedc1 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -369,7 +369,7 @@
 
         docloc = os.environ.get("PYTHONDOCS", self.PYTHONDOCS)
 
-        basedir = os.path.join(sys.exec_prefix, "lib",
+        basedir = os.path.join(sys.base_exec_prefix, "lib",
                                "python%d.%d" %  sys.version_info[:2])
         if (isinstance(object, type(os)) and
             (object.__name__ in ('errno', 'exceptions', 'gc', 'imp',