diff --git a/rpcs3/Emu/Cell/PPUInterpreter.cpp b/rpcs3/Emu/Cell/PPUInterpreter.cpp
index b31c009e70..edaa3a6126 100644
--- a/rpcs3/Emu/Cell/PPUInterpreter.cpp
+++ b/rpcs3/Emu/Cell/PPUInterpreter.cpp
@@ -4487,7 +4487,7 @@ bool ppu_interpreter::STW(ppu_thread& ppu, ppu_opcode_t op)
 	//Insomniac engine v3 & v4 (newer R&C, Fuse, Resitance 3)
 	if (value == 0xAAAAAAAA) [[unlikely]]
 	{
-		vm::reservation_update(vm::cast(addr, HERE), 128);
+		vm::reservation_update(vm::cast(addr, HERE));
 	}
 
 	return true;
diff --git a/rpcs3/Emu/Memory/vm.cpp b/rpcs3/Emu/Memory/vm.cpp
index ee19f24591..b1b5ca363b 100644
--- a/rpcs3/Emu/Memory/vm.cpp
+++ b/rpcs3/Emu/Memory/vm.cpp
@@ -80,15 +80,25 @@ namespace vm
 	// Memory pages
 	std::array<memory_page, 0x100000000 / 4096> g_pages{};
 
-	void reservation_update(u32 addr, u32 size, bool lsb)
+	std::pair<bool, u64> try_reservation_update(u32 addr)
+	{
+		// Update reservation info with new timestamp
+		auto& res = reservation_acquire(addr, 1);
+		const u64 rtime = res;
+
+		return {!(rtime & vm::rsrv_unique_lock) && res.compare_and_swap_test(rtime, rtime + 128), rtime};
+	}
+
+	void reservation_update(u32 addr)
 	{
 		u64 old = UINT64_MAX;
 		const auto cpu = get_current_cpu_thread();
 
 		while (true)
 		{
-			const auto [ok, rtime] = try_reservation_update(addr, size, lsb);
-			if (ok || old / 128 < rtime / 128)
+			const auto [ok, rtime] = try_reservation_update(addr);
+
+			if (ok || (old & -128) < (rtime & -128))
 			{
 				return;
 			}
diff --git a/rpcs3/Emu/Memory/vm_reservation.h b/rpcs3/Emu/Memory/vm_reservation.h
index 2b022659f6..c4493998af 100644
--- a/rpcs3/Emu/Memory/vm_reservation.h
+++ b/rpcs3/Emu/Memory/vm_reservation.h
@@ -25,16 +25,7 @@ namespace vm
 	}
 
 	// Update reservation status
-	inline std::pair<bool, u64> try_reservation_update(u32 addr, u32 size, bool lsb = false)
-	{
-		// Update reservation info with new timestamp
-		auto& res = reservation_acquire(addr, size);
-		const u64 rtime = res;
-
-		return {!(rtime & 127) && res.compare_and_swap_test(rtime, rtime + 128), rtime};
-	}
-
-	void reservation_update(u32 addr, u32 size, bool lsb = false);
+	void reservation_update(u32 addr);
 
 	// Get reservation sync variable
 	inline atomic_t<u64>& reservation_notifier(u32 addr, u32 size)
diff --git a/rpcs3/rpcs3qt/register_editor_dialog.cpp b/rpcs3/rpcs3qt/register_editor_dialog.cpp
index c85bcb115e..76f1f20f8f 100644
--- a/rpcs3/rpcs3qt/register_editor_dialog.cpp
+++ b/rpcs3/rpcs3qt/register_editor_dialog.cpp
@@ -240,7 +240,7 @@ void register_editor_dialog::OnOkay(const std::shared_ptr<cpu_thread>& _cpu)
 		// Invalid integer
 		value.clear();
 	}
-	
+
 	if (!cpu || value.empty())
 	{
 	}
@@ -251,7 +251,7 @@ void register_editor_dialog::OnOkay(const std::shared_ptr<cpu_thread>& _cpu)
 		if (reg >= ppu_r0 && reg <= ppu_v31)
 		{
 			const u32 reg_index = reg % 32;
-	
+
 			if ((reg >= ppu_r0 && reg <= ppu_r31) || (reg >= ppu_f0 && reg <= ppu_f31))
 			{
 				if (u64 reg_value; check_res(std::from_chars(value.c_str() + 16, value.c_str() + 32, reg_value, 16), value.c_str() + 32))
@@ -306,7 +306,7 @@ void register_editor_dialog::OnOkay(const std::shared_ptr<cpu_thread>& _cpu)
 		}
 		else if (reg == RESERVATION_LOST)
 		{
-			if (u32 raddr = ppu.raddr) vm::reservation_update(raddr, 128);
+			if (u32 raddr = ppu.raddr) vm::reservation_update(raddr);
 			return;
 		}
 	}
@@ -357,7 +357,7 @@ void register_editor_dialog::OnOkay(const std::shared_ptr<cpu_thread>& _cpu)
 		}
 		else if (reg == RESERVATION_LOST)
 		{
-			if (u32 raddr = spu.raddr) vm::reservation_update(raddr, 128);
+			if (u32 raddr = spu.raddr) vm::reservation_update(raddr);
 			return;
 		}
 	}