diff --git a/src/emulator/memory_manager.cpp b/src/emulator/memory_manager.cpp
index 0dee8de..80ec85c 100644
--- a/src/emulator/memory_manager.cpp
+++ b/src/emulator/memory_manager.cpp
@@ -63,26 +63,16 @@ namespace
 	}
 }
 
-static void serialize(utils::buffer_serializer& buffer, const memory_manager::committed_region& region)
-{
-	buffer.write<uint64_t>(region.length);
-	buffer.write(region.pemissions);
-}
-
-static void deserialize(utils::buffer_deserializer& buffer, memory_manager::committed_region& region)
-{
-	region.length = static_cast<size_t>(buffer.read<uint64_t>());
-	region.pemissions = buffer.read<memory_permission>();
-}
-
 static void serialize(utils::buffer_serializer& buffer, const memory_manager::reserved_region& region)
 {
+	buffer.write(region.is_mmio);
 	buffer.write<uint64_t>(region.length);
 	buffer.write_map(region.committed_regions);
 }
 
 static void deserialize(utils::buffer_deserializer& buffer, memory_manager::reserved_region& region)
 {
+	buffer.read(region.is_mmio);
 	region.length = static_cast<size_t>(buffer.read<uint64_t>());
 	buffer.read_map(region.committed_regions);
 }
@@ -100,6 +90,11 @@ void memory_manager::serialize_memory_state(utils::buffer_serializer& buffer, co
 
 	for (const auto& reserved_region : this->reserved_regions_)
 	{
+		if (reserved_region.second.is_mmio)
+		{
+			continue;
+		}
+
 		for (const auto& region : reserved_region.second.committed_regions)
 		{
 			data.resize(region.second.length);
@@ -133,9 +128,18 @@ void memory_manager::deserialize_memory_state(utils::buffer_deserializer& buffer
 
 	std::vector<uint8_t> data{};
 
-	for (const auto& reserved_region : this->reserved_regions_)
+	for (auto i = this->reserved_regions_.begin(); i != this->reserved_regions_.end();)
 	{
-		for (const auto& region : reserved_region.second.committed_regions)
+		auto& reserved_region = i->second;
+		if (reserved_region.is_mmio)
+		{
+			i = this->reserved_regions_.erase(i);
+			continue;
+		}
+
+		++i;
+
+		for (const auto& region : reserved_region.committed_regions)
 		{
 			data.resize(region.second.length);
 
@@ -198,7 +202,7 @@ bool memory_manager::protect_memory(const uint64_t address, const size_t size, c
 	return true;
 }
 
-bool memory_manager::allocate_mmio(uint64_t address, size_t size, mmio_read_callback read_cb,
+bool memory_manager::allocate_mmio(const uint64_t address, const size_t size, mmio_read_callback read_cb,
                                    mmio_write_callback write_cb)
 {
 	if (this->overlaps_reserved_region(address, size))
@@ -208,10 +212,13 @@ bool memory_manager::allocate_mmio(uint64_t address, size_t size, mmio_read_call
 
 	this->map_mmio(address, size, std::move(read_cb), std::move(write_cb));
 
-	const auto entry = this->reserved_regions_.try_emplace(address, size).first;
-	entry->second.committed_regions[address] = committed_region{
-		.length = size, .pemissions = memory_permission::read_write, .is_mmio = true,
-	};
+	const auto entry = this->reserved_regions_.try_emplace(address,
+	                                                       reserved_region{
+		                                                       .length = size,
+		                                                       .is_mmio = true,
+	                                                       }).first;
+
+	entry->second.committed_regions[address] = committed_region{size, memory_permission::read_write};
 
 	return true;
 }
@@ -229,9 +236,7 @@ bool memory_manager::allocate_memory(const uint64_t address, const size_t size,
 	if (!reserve_only)
 	{
 		this->map_memory(address, size, permissions);
-		entry->second.committed_regions[address] = committed_region{
-			.length = size, .pemissions = memory_permission::read_write
-		};
+		entry->second.committed_regions[address] = committed_region{size, memory_permission::read_write};
 	}
 
 	return true;
@@ -304,6 +309,11 @@ bool memory_manager::decommit_memory(const uint64_t address, const size_t size)
 		return false;
 	}
 
+	if (entry->second.is_mmio)
+	{
+		throw std::runtime_error("Not allowed to decommit MMIO!");
+	}
+
 	const auto end = address + size;
 	const auto region_end = entry->first + entry->second.length;
 
@@ -323,11 +333,6 @@ bool memory_manager::decommit_memory(const uint64_t address, const size_t size)
 			break;
 		}
 
-		if (i->second.is_mmio)
-		{
-			throw std::runtime_error("Not allowed to decommit MMIO!");
-		}
-
 		const auto sub_region_end = i->first + i->second.length;
 		if (i->first >= address && sub_region_end <= end)
 		{
diff --git a/src/emulator/memory_manager.hpp b/src/emulator/memory_manager.hpp
index b88d1ce..d78d43a 100644
--- a/src/emulator/memory_manager.hpp
+++ b/src/emulator/memory_manager.hpp
@@ -23,7 +23,6 @@ class memory_manager
 	{
 		size_t length{};
 		memory_permission pemissions{};
-		bool is_mmio{false};
 	};
 
 	using committed_region_map = std::map<uint64_t, committed_region>;
@@ -32,6 +31,7 @@ class memory_manager
 	{
 		size_t length{};
 		committed_region_map committed_regions{};
+		bool is_mmio{false};
 	};
 
 	virtual ~memory_manager() = default;