diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 9589771542e..a8829849b86 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -391,6 +391,10 @@ class SysModuleTest(unittest.TestCase):
         out = p.stdout.read().strip()
         self.assertEqual(out, '?')
 
+    def test_call_tracing(self):
+        self.assertEqual(sys.call_tracing(str, (2,)), "2")
+        self.assertRaises(TypeError, sys.call_tracing, str, 2)
+
 
 class SizeofTest(unittest.TestCase):
 
diff --git a/Misc/NEWS b/Misc/NEWS
index d299a68e20c..200764dd444 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@ What's New in Python 2.6.5
 Core and Builtins
 -----------------
 
+- Issue #7819: Check sys.call_tracing() arguments types.
+
 - Issue #7788: Fix an interpreter crash produced by deleting a list
   slice with very large step value.
 
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 10ba1cf668d..721f77da9ad 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -802,7 +802,7 @@ static PyObject *
 sys_call_tracing(PyObject *self, PyObject *args)
 {
 	PyObject *func, *funcargs;
-	if (!PyArg_UnpackTuple(args, "call_tracing", 2, 2, &func, &funcargs))
+	if (!PyArg_ParseTuple(args, "OO!:call_tracing", &func, &PyTuple_Type, &funcargs))
 		return NULL;
 	return _PyEval_CallTracing(func, funcargs);
 }