diff --git a/arch/x86/mm/page.c b/arch/x86/mm/page.c
index cc767a43..b2cfaad4 100644
--- a/arch/x86/mm/page.c
+++ b/arch/x86/mm/page.c
@@ -367,6 +367,9 @@ size_t map_region(size_t viraddr, size_t phyaddr, uint32_t npages, uint32_t flag
 		if (flags & MAP_NO_ACCESS)
 			pgt->entries[index] &= ~PG_PRESENT;
 
+		if (flags & MAP_WT)
+			pgt->entries[index] |= PG_PWT;
+
 		if (flags & MAP_USER_SPACE)
 			atomic_int32_inc(&task->user_usage);
 
diff --git a/include/metalsvm/stdlib.h b/include/metalsvm/stdlib.h
index 15d0961e..0a568204 100644
--- a/include/metalsvm/stdlib.h
+++ b/include/metalsvm/stdlib.h
@@ -41,7 +41,7 @@ extern "C" {
 #define MAP_USER_SPACE		(1 << 1)
 #define MAP_PAGE_TABLE		(1 << 2)
 #define MAP_NO_CACHE		(1 << 3)
-//#define MAP_STACK		(1 << 4)
+#define MAP_WT			(1 << 5)
 //#define MAP_HEAP		(1 << 5)
 #define MAP_CODE		(1 << 6)
 #define MAP_READONLY		(1 << 7)