diff --git a/kernel/include/kernel/BootInfo.h b/kernel/include/kernel/BootInfo.h
index 2d6c8e19..60e517a6 100644
--- a/kernel/include/kernel/BootInfo.h
+++ b/kernel/include/kernel/BootInfo.h
@@ -44,7 +44,7 @@ namespace Kernel
 	struct BootModule
 	{
 		paddr_t start;
-		size_t size;
+		uint64_t size;
 	};
 
 	struct BootInfo
diff --git a/kernel/include/kernel/Memory/PhysicalRange.h b/kernel/include/kernel/Memory/PhysicalRange.h
index 5dd14911..1d0a0484 100644
--- a/kernel/include/kernel/Memory/PhysicalRange.h
+++ b/kernel/include/kernel/Memory/PhysicalRange.h
@@ -10,7 +10,7 @@ namespace Kernel
 	class PhysicalRange
 	{
 	public:
-		PhysicalRange(paddr_t, size_t);
+		PhysicalRange(paddr_t, uint64_t);
 
 		paddr_t reserve_page();
 		void release_page(paddr_t);
diff --git a/kernel/kernel/Memory/Heap.cpp b/kernel/kernel/Memory/Heap.cpp
index 191b84ba..980e9847 100644
--- a/kernel/kernel/Memory/Heap.cpp
+++ b/kernel/kernel/Memory/Heap.cpp
@@ -12,7 +12,7 @@ namespace Kernel
 	struct ReservedRegion
 	{
 		paddr_t paddr;
-		size_t size;
+		uint64_t size;
 	};
 
 	static BAN::Vector<ReservedRegion> get_reserved_regions()
@@ -138,10 +138,10 @@ namespace Kernel
 				MUST(m_physical_ranges.emplace_back(e_start, e_end - e_start));
 		}
 
-		size_t total_kibi_bytes = 0;
+		uint64_t total_kibi_bytes = 0;
 		for (auto& range : m_physical_ranges)
 		{
-			const size_t kibi_bytes = range.usable_memory() / 1024;
+			const uint64_t kibi_bytes = range.usable_memory() / 1024;
 			dprintln("RAM {8H}->{8H} ({}.{3} MiB)", range.start(), range.end(), kibi_bytes / 1024, kibi_bytes % 1024);
 			total_kibi_bytes += kibi_bytes;
 		}
@@ -152,7 +152,7 @@ namespace Kernel
 	{
 		const auto modules = BAN::move(g_boot_info.modules);
 
-		size_t kibi_bytes = 0;
+		uint64_t kibi_bytes = 0;
 		for (const auto& module : modules)
 		{
 			vaddr_t start = module.start;
diff --git a/kernel/kernel/Memory/PhysicalRange.cpp b/kernel/kernel/Memory/PhysicalRange.cpp
index 38f6a12c..9c763c39 100644
--- a/kernel/kernel/Memory/PhysicalRange.cpp
+++ b/kernel/kernel/Memory/PhysicalRange.cpp
@@ -10,7 +10,7 @@ namespace Kernel
 
 	static constexpr size_t bits_per_page = PAGE_SIZE * 8;
 
-	PhysicalRange::PhysicalRange(paddr_t paddr, size_t size)
+	PhysicalRange::PhysicalRange(paddr_t paddr, uint64_t size)
 		: m_paddr(paddr)
 		, m_page_count(size / PAGE_SIZE)
 		, m_free_pages(m_page_count)