diff --git a/pywikidiff2/pywikidiff2.cpp b/pywikidiff2/pywikidiff2.cpp
index f986a86..d2286bd 100644
--- a/pywikidiff2/pywikidiff2.cpp
+++ b/pywikidiff2/pywikidiff2.cpp
@@ -45,7 +45,7 @@ pywikidiff2_init(pywikidiff2Obj *self, PyObject *args, PyObject *kwds)
 {
   // here's where we set non-default configuration values
   static char *kwlist[] = {"num_context_lines", "moved_line_threshold", "change_threshold", "moved_paragraph_detection_cutoff", "max_word_level_diff_complexity", "max_split_size", "initial_split_threshold", "final_split_threshold", "words_cache_capacity", "diff_cache_capacity", "stats_cache_capacity", NULL};
-  if (!PyArg_ParseTupleAndKeywords(args, kwds, "|iffiiiff", kwlist,
+  if (!PyArg_ParseTupleAndKeywords(args, kwds, "|iffiiiffiii", kwlist,
 				   &self->config.numContextLines,
 				   &self->config.movedLineThreshold,
 				   &self->config.changeThreshold,