diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 3a80b73e0be..fe322d22b86 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -254,7 +254,7 @@ PyByteArray_Concat(PyObject *a, PyObject *b)
     if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 ||
         PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) {
             PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
-                         Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
+                         Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name);
             goto done;
     }
 
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 1050a93e6e4..bde7948c109 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -1438,7 +1438,7 @@ bytes_concat(PyObject *a, PyObject *b)
     if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 ||
         PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) {
         PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",
-                     Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
+                     Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name);
         goto done;
     }