--- contrib/tools/python3/Objects/codeobject.c	(index)
+++ contrib/tools/python3/Objects/codeobject.c	(working tree)
@@ -768,7 +768,7 @@ PyCode_Addr2Line(PyCodeObject *co, int addrq)
     if (addrq < 0) {
         return co->co_firstlineno;
     }
-    assert(addrq >= 0 && addrq < _PyCode_NBYTES(co));
+    assert(addrq >= 0 && addrq <= _PyCode_NBYTES(co));
     PyCodeAddressRange bounds;
     _PyCode_InitAddressRange(co, &bounds);
     return _PyCode_CheckLineNumber(addrq, &bounds);