diff --git a/Userland/Services/ChessEngine/MCTSTree.h b/Userland/Services/ChessEngine/MCTSTree.h
index 4241980822..6d522ccaf4 100644
--- a/Userland/Services/ChessEngine/MCTSTree.h
+++ b/Userland/Services/ChessEngine/MCTSTree.h
@@ -36,7 +36,7 @@ public:
 private:
     // While static parameters are less configurable, they don't take up any
     // memory in the tree, which I believe to be a worthy tradeoff.
-    static constexpr double s_exploration_parameter { sqrt(2) };
+    static constexpr double s_exploration_parameter { M_SQRT2 };
     // FIXME: Optimize simulations enough for use.
     static constexpr EvalMethod s_eval_method { EvalMethod::Heuristic };