diff --git a/src/keys.c b/src/keys.c
index 46dbf651..1362b128 100644
--- a/src/keys.c
+++ b/src/keys.c
@@ -142,7 +142,7 @@ static PyObject* PyXmlSec_KeyFromFile(PyObject* self, PyObject* args, PyObject*
     Py_ssize_t data_size = 0;
 
     PYXMLSEC_DEBUG("load key from file - start");
-    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "OH|z:from_file", kwlist, &file, &format, &password)) {
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "OI|z:from_file", kwlist, &file, &format, &password)) {
         goto ON_FAIL;
     }