diff --git a/src/Test.sol b/src/Test.sol
index af91dd81..92fcc3a6 100644
--- a/src/Test.sol
+++ b/src/Test.sol
@@ -28,5 +28,5 @@ import {TestBase} from "./Base.sol";
 // ⭐️ TEST
 abstract contract Test is TestBase, StdAssertions, StdChains, StdCheats, StdInvariant, StdUtils {
     // Note: IS_TEST() must return true.
-    bool public IS_TEST = true;
+    bool public constant IS_TEST = true;
 }