diff --git a/Analysis/include/Luau/Differ.h b/Analysis/include/Luau/Differ.h
index d9b78939..9347729a 100644
--- a/Analysis/include/Luau/Differ.h
+++ b/Analysis/include/Luau/Differ.h
@@ -158,8 +158,8 @@ struct DifferEnvironment
 {
     TypeId rootLeft;
     TypeId rootRight;
-    std::optional<std::string> externalSymbolLeft;
-    std::optional<std::string> externalSymbolRight;
+    std::optional<std::string> externalSymbolLeft = std::nullopt;
+    std::optional<std::string> externalSymbolRight = std::nullopt;
     DenseHashMap<TypeId, TypeId> genericMatchedPairs;
     DenseHashMap<TypePackId, TypePackId> genericTpMatchedPairs;