diff --git a/kernel/arch/i386/MMU.cpp b/kernel/arch/i386/MMU.cpp
index 589490ea5..80f86ebfa 100644
--- a/kernel/arch/i386/MMU.cpp
+++ b/kernel/arch/i386/MMU.cpp
@@ -63,7 +63,7 @@ MMU::MMU()
 
 	// dont map first page (0 -> 4 KiB) so that nullptr dereference
 	// causes page fault :)
-	uint64_t* page_table1 = (uint64_t*)page_directory1[0];
+	uint64_t* page_table1 = (uint64_t*)(page_directory1[0] & PAGE_MASK);
 	page_table1[0] = 0;
 
 	// reload this new pdpt