diff --git a/src/backend/core/JIT.cpp b/src/backend/core/JIT.cpp
index 5ebf85fc..ec935a85 100644
--- a/src/backend/core/JIT.cpp
+++ b/src/backend/core/JIT.cpp
@@ -40,7 +40,7 @@ int JIT::Step() {
   }
 
   u32 upperIndex = paddr >> kUpperShift;
-  u32 lowerIndex = paddr & 0xff;
+  u32 lowerIndex = paddr & kLowerMask;
 
   if (!blockCache[upperIndex].empty()) {
     if (blockCache[upperIndex][lowerIndex]) {
diff --git a/src/backend/core/JIT.hpp b/src/backend/core/JIT.hpp
index 7420aafb..4462dee5 100644
--- a/src/backend/core/JIT.hpp
+++ b/src/backend/core/JIT.hpp
@@ -44,9 +44,9 @@ private:
   friend struct Cop1;
   friend struct Registers;
   using BlockFn = int (*)();
+  std::vector<std::vector<BlockFn>> blockCache;
   Xbyak::Label branch_likely_not_taken;
 
-  std::vector<std::vector<BlockFn>> blockCache;
   template <typename T>
   Xbyak::Address GPR(const size_t index) const {
     if constexpr (sizeof(T) == 1) {