diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index f58d900..6b45d12 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -433,6 +433,10 @@
         out = p.communicate()[0].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 5f64b8a..6b0f121 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 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 3a99197..65a9d8f 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -840,7 +840,7 @@
 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);
 }