diff --git a/compiler/test_gen/src/gen_num.rs b/compiler/test_gen/src/gen_num.rs
index 9ea315abfa..c07b605fbc 100644
--- a/compiler/test_gen/src/gen_num.rs
+++ b/compiler/test_gen/src/gen_num.rs
@@ -1364,4 +1364,9 @@ mod gen_num {
         assert_evals_to!("Num.shiftRightBy 2 0b0000_0010u8", 0b0000_0001, i64);
         assert_evals_to!("Num.shiftRightBy 3 0b0000_1100u8", 0b0000_0011, i64);
     }
+
+    #[test]
+    fn max_i128() {
+        assert_evals_to!("Num.maxI128", i128::MAX, i128);
+    }
 }