diff --git a/kernel/arch/i686/PageTable.cpp b/kernel/arch/i686/PageTable.cpp
index c953b2b0a5..60d568a09f 100644
--- a/kernel/arch/i686/PageTable.cpp
+++ b/kernel/arch/i686/PageTable.cpp
@@ -369,13 +369,12 @@ namespace Kernel
 		if (flags & Flags::Reserved)
 			extra_flags |= Flags::Reserved;
 
-		if (s_has_pat)
-		{
-			if (memory_type == MemoryType::WriteCombining)
-				extra_flags |= (1ull << 7);
-			if (memory_type == MemoryType::WriteThrough)
-				extra_flags |= (1ull << 7) | (1ull << 3);
-		}
+		if (memory_type == MemoryType::Uncached)
+			extra_flags |= (1ull << 4);
+		if (s_has_pat && memory_type == MemoryType::WriteCombining)
+			extra_flags |= (1ull << 7);
+		if (s_has_pat && memory_type == MemoryType::WriteThrough)
+			extra_flags |= (1ull << 7) | (1ull << 3);
 
 		// NOTE: we add present here, since it has to be available in higher level structures
 		flags_t uwr_flags = (flags & (Flags::UserSupervisor | Flags::ReadWrite)) | Flags::Present;
diff --git a/kernel/arch/x86_64/PageTable.cpp b/kernel/arch/x86_64/PageTable.cpp
index 313d8d2b73..65cd0bfebb 100644
--- a/kernel/arch/x86_64/PageTable.cpp
+++ b/kernel/arch/x86_64/PageTable.cpp
@@ -417,6 +417,8 @@ namespace Kernel
 		if (flags & Flags::Reserved)
 			extra_flags |= Flags::Reserved;
 
+		if (memory_type == MemoryType::Uncached)
+			extra_flags |= (1ull << 4);
 		if (memory_type == MemoryType::WriteCombining)
 			extra_flags |= (1ull << 7);
 		if (memory_type == MemoryType::WriteThrough)
diff --git a/kernel/include/kernel/Memory/PageTable.h b/kernel/include/kernel/Memory/PageTable.h
index aa92b27379..a1cc2b83ee 100644
--- a/kernel/include/kernel/Memory/PageTable.h
+++ b/kernel/include/kernel/Memory/PageTable.h
@@ -37,6 +37,7 @@ namespace Kernel
 		enum MemoryType
 		{
 			Normal,
+			Uncached,
 			WriteCombining,
 			WriteThrough,
 		};
diff --git a/kernel/kernel/Memory/DMARegion.cpp b/kernel/kernel/Memory/DMARegion.cpp
index ae61ba6f14..6ab9e592e6 100644
--- a/kernel/kernel/Memory/DMARegion.cpp
+++ b/kernel/kernel/Memory/DMARegion.cpp
@@ -26,7 +26,7 @@ namespace Kernel
 		vaddr_guard.disable();
 		paddr_guard.disable();
 
-		PageTable::kernel().map_range_at(paddr, vaddr, size, PageTable::Flags::ReadWrite | PageTable::Flags::Present);
+		PageTable::kernel().map_range_at(paddr, vaddr, size, PageTable::Flags::ReadWrite | PageTable::Flags::Present, PageTable::MemoryType::Uncached);
 
 		return BAN::UniqPtr<DMARegion>::adopt(region_ptr);
 	}
diff --git a/kernel/kernel/PCI.cpp b/kernel/kernel/PCI.cpp
index cc94ea1a70..66c77c3af8 100644
--- a/kernel/kernel/PCI.cpp
+++ b/kernel/kernel/PCI.cpp
@@ -246,7 +246,7 @@ namespace Kernel::PCI
 		{
 			vaddr_t vaddr = PageTable::kernel().reserve_free_page(KERNEL_OFFSET);
 			ASSERT(vaddr);
-			PageTable::kernel().map_page_at(pcie_paddr, vaddr, PageTable::Flags::ReadWrite | PageTable::Flags::Present);
+			PageTable::kernel().map_page_at(pcie_paddr, vaddr, PageTable::Flags::ReadWrite | PageTable::Flags::Present, PageTable::MemoryType::Uncached);
 			m_mmio_config = vaddr;
 		}