diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 7106014..7b13fa0 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -1631,7 +1631,7 @@
                         "invalid type");
         return NULL;
     }
-    if (PySys_Audit("ctypes.addressof", "O", obj) < 0) {
+    if (PySys_Audit("ctypes.addressof", "(O)", obj) < 0) {
         return NULL;
     }
     return PyLong_FromVoidPtr(((CDataObject *)obj)->b_ptr);
@@ -1651,7 +1651,7 @@
     if (!PyArg_ParseTuple(args, "O&:PyObj_FromPtr", converter, &ob)) {
         return NULL;
     }
-    if (PySys_Audit("ctypes.PyObj_FromPtr", "O", ob) < 0) {
+    if (PySys_Audit("ctypes.PyObj_FromPtr", "(O)", ob) < 0) {
         return NULL;
     }
     Py_INCREF(ob);