diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index bdc17ee..c3de80a 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -48,6 +48,7 @@
 /* Predefined exceptions */
 
 extern DL_IMPORT(PyObject *) PyExc_AccessError;
+extern DL_IMPORT(PyObject *) PyExc_AssertionError;
 extern DL_IMPORT(PyObject *) PyExc_AttributeError;
 extern DL_IMPORT(PyObject *) PyExc_EOFError;
 extern DL_IMPORT(PyObject *) PyExc_FloatingPointError;