diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index 9d8be0599..740c0ada0 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -187,9 +187,9 @@ try:
     if not hasattr(markdown, '__version__') and markdown.version <= '2.2':
         HEADERID_EXT_PATH = 'headerid'
         LEVEL_PARAM = 'level'
-    elif (not hasattr(markdown, '__version__') or
-          (isinstance(markdown.__version__, type(''))
-           and markdown.version < '2.6')):
+    elif ((not hasattr(markdown, '__version__')
+           ) or ((not isinstance(markdown.__version__, type(''))
+                  ) and markdown.version < '2.6')):
         HEADERID_EXT_PATH = 'markdown.extensions.headerid'
         LEVEL_PARAM = 'level'
     else: