--- a/tests/runtests.py
+++ b/tests/runtests.py
@@ -142,17 +142,17 @@ for makefile in makefiles:
             d['returncode'] = data
         elif key == 'returncode-on':
             if sys.platform in data:
                 d['returncode'] = data[sys.platform]
         elif key == 'environment':
             for k, v in data.iteritems():
                 d['env'][k] = v
         elif key == 'grep-for':
-            grepfor = data
+            d['grepfor'] = data
         elif key == 'fail':
             d['pass'] = False
         elif key == 'skip':
             d['skip'] = True
         else:
             print >>sys.stderr, "%s: Unexpected #T key: %s" % (makefile, key)
             sys.exit(1)