diff --git a/src/lpython/semantics/python_comptime_eval.h b/src/lpython/semantics/python_comptime_eval.h
index 83b3a64ed1..b8db20bbf2 100644
--- a/src/lpython/semantics/python_comptime_eval.h
+++ b/src/lpython/semantics/python_comptime_eval.h
@@ -67,6 +67,7 @@ struct PythonIntrinsicProcedures {
             {"_mod", {m_builtin, &eval__mod}},
             {"max" , {m_builtin , &eval_max}},
             {"min" , {m_builtin , &eval_min}},
+            {"sum" , {m_builtin , &not_implemented}},
             // The following functions for string methods are not used
             // for evaluation.
             {"_lpython_str_capitalize", {m_builtin, &not_implemented}},