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-rw-r--r--src/value.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/value.ml b/src/value.ml
index 6c2e0839..e44ebda8 100644
--- a/src/value.ml
+++ b/src/value.ml
@@ -724,6 +724,7 @@ let primops =
("undefined_unit", fun _ -> V_unit);
("undefined_bit", fun _ -> V_bit Sail_lib.B0);
("undefined_int", fun _ -> V_int Big_int.zero);
+ ("undefined_nat", fun _ -> V_int Big_int.zero);
("undefined_bool", fun _ -> V_bool false);
("undefined_vector", value_undefined_vector);
("undefined_string", fun _ -> V_string "");