diff --git a/kernel/include/kernel/GDT.h b/kernel/include/kernel/GDT.h
index 251ff0ab..5f5d3093 100644
--- a/kernel/include/kernel/GDT.h
+++ b/kernel/include/kernel/GDT.h
@@ -5,6 +5,11 @@
 namespace Kernel::GDT
 {
 
+	static constexpr inline bool is_user_segment(uint8_t segment)
+	{
+		return (segment & 3) == 3;
+	}
+
 	void initialize();
 	void set_tss_stack(uintptr_t);