diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 4878d83..670f589 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -1215,7 +1215,7 @@
     Py_ssize_t ival = PyNumber_AsSsize_t(arg, PyExc_ValueError);
     if (ival == -1 && PyErr_Occurred()) {
         Py_buffer varg;
-        int pos;
+        Py_ssize_t pos;
         PyErr_Clear();
         if (_getbuffer(arg, &varg) < 0)
             return -1;
@@ -1229,7 +1229,7 @@
         return -1;
     }
 
-    return memchr(PyByteArray_AS_STRING(self), ival, Py_SIZE(self)) != NULL;
+    return memchr(PyByteArray_AS_STRING(self), (int) ival, Py_SIZE(self)) != NULL;
 }