diff --git a/python/r2pipe/native.py b/python/r2pipe/native.py
index 8476d90..6630f45 100644
--- a/python/r2pipe/native.py
+++ b/python/r2pipe/native.py
@@ -125,6 +125,8 @@ def __init__(self):
         self._r_core_free = register("r_core_free", "c_void_p", "c_void_p")
     def __del__(self):
         self._r_core_free[1](self._o)
+    def free(self):
+        self._r_core_free[1](self._o)
     def cmd_str(self, cmd):
         return self._r_core_cmd_str[1](self._o, cmd)
 
diff --git a/python/test/test_integration.py b/python/test/test_integration.py
index 7c88a76..0873d28 100644
--- a/python/test/test_integration.py
+++ b/python/test/test_integration.py
@@ -92,5 +92,5 @@ def test_r2cmd_no_nullbyte_bug(self):
         import r2pipe
         r = r2pipe.open('/bin/ls')
 
-        result = r.cmd('prx @ rsp')
+        result = r.cmd('prx @r:SP')
         self.assertNotEqual(result, '')