diff --git a/arch/x86_64/pmap.c b/arch/x86_64/pmap.c
index a511166..ac42ffc 100644
--- a/arch/x86_64/pmap.c
+++ b/arch/x86_64/pmap.c
@@ -364,7 +364,12 @@ kern_status_t pmap_handle_fault(
 	struct task *task = current_task();
 	struct vm_region *space = task->t_address_space;
 
-	return vm_region_demand_map(space, fault_addr, flags);
+	unsigned long lock_flags;
+	vm_region_lock_irqsave(space, &lock_flags);
+	kern_status_t status = vm_region_demand_map(space, fault_addr, flags);
+	vm_region_unlock_irqrestore(space, lock_flags);
+
+	return status;
 }
 
 kern_status_t pmap_add(