diff --git a/Source/JavaScriptCore/runtime/OptionsList.h b/Source/JavaScriptCore/runtime/OptionsList.h
index 41cab118..2ac66c7a 100644
--- a/Source/JavaScriptCore/runtime/OptionsList.h
+++ b/Source/JavaScriptCore/runtime/OptionsList.h
@@ -90,9 +90,9 @@ constexpr bool enableWebAssemblyStreamingApi = false;
     \
     v(Bool, reportMustSucceedExecutableAllocations, false, Normal, nullptr) \
     \
-    v(Unsigned, maxPerThreadStackUsage, 5 * MB, Normal, "Max allowed stack usage by the VM") \
-    v(Unsigned, softReservedZoneSize, 128 * KB, Normal, "A buffer greater than reservedZoneSize that reserves space for stringifying exceptions.") \
-    v(Unsigned, reservedZoneSize, 64 * KB, Normal, "The amount of stack space we guarantee to our clients (and to interal VM code that does not call out to clients).") \
+    v(Unsigned, maxPerThreadStackUsage, 80 * KB , Normal, "Max allowed stack usage by the VM") \
+    v(Unsigned, softReservedZoneSize, 32 * KB, Normal, "A buffer greater than reservedZoneSize that reserves space for stringifying exceptions.") \
+    v(Unsigned, reservedZoneSize, 16 * KB, Normal, "The amount of stack space we guarantee to our clients (and to interal VM code that does not call out to clients).") \
     \
     v(Bool, crashIfCantAllocateJITMemory, false, Normal, nullptr) \
     v(Unsigned, jitMemoryReservationSize, 0, Normal, "Set this number to change the executable allocation size in ExecutableAllocatorFixedVMPool. (In bytes.)") \