diff --git a/rpcs3/Emu/Cell/PPUThread.cpp b/rpcs3/Emu/Cell/PPUThread.cpp
index 8924434fd9..b45f665fc0 100644
--- a/rpcs3/Emu/Cell/PPUThread.cpp
+++ b/rpcs3/Emu/Cell/PPUThread.cpp
@@ -1005,11 +1005,13 @@ static T ppu_load_acquire_reservation(ppu_thread& ppu, u32 addr)
 
 extern u32 ppu_lwarx(ppu_thread& ppu, u32 addr)
 {
+	ppu.lr_64 = false;
 	return ppu_load_acquire_reservation<u32>(ppu, addr);
 }
 
 extern u64 ppu_ldarx(ppu_thread& ppu, u32 addr)
 {
+	ppu.lr_64 = true;
 	return ppu_load_acquire_reservation<u64>(ppu, addr);
 }
 
@@ -1064,6 +1066,8 @@ extern bool ppu_stwcx(ppu_thread& ppu, u32 addr, u32 reg_value)
 {
 	atomic_be_t<u32>& data = vm::_ref<atomic_be_t<u32>>(addr);
 
+	if (UNLIKELY(ppu.lr_64)) ppu.rdata >>= 32;
+
 	if (ppu.raddr != addr || ppu.rdata != data.load() || ppu.rtime != vm::reservation_acquire(addr, sizeof(u32)))
 	{
 		ppu.raddr = 0;
diff --git a/rpcs3/Emu/Cell/PPUThread.h b/rpcs3/Emu/Cell/PPUThread.h
index c4394dbbc4..d9bc6a9981 100644
--- a/rpcs3/Emu/Cell/PPUThread.h
+++ b/rpcs3/Emu/Cell/PPUThread.h
@@ -135,6 +135,7 @@ public:
 	u32 raddr{0}; // Reservation addr
 	u64 rtime{0};
 	u64 rdata{0}; // Reservation data
+	bool lr_64{false}; // Reservation size (true for 64 bit, false for 32 bit)
 
 	atomic_t<u32> prio{0}; // Thread priority (0..3071)
 	const u32 stack_size; // Stack size