diff --git a/headers/private/kernel/arch/x86/arch_cpu.h b/headers/private/kernel/arch/x86/arch_cpu.h
index 7d717d8b90..4f84cc7a35 100644
--- a/headers/private/kernel/arch/x86/arch_cpu.h
+++ b/headers/private/kernel/arch/x86/arch_cpu.h
@@ -84,6 +84,7 @@
 #define IA32_FEATURE_AMD_EXT_3DNOW		(1 << 31)	// 3DNow!
 
 // cr4 flags
+#define IA32_CR4_PAE					(1UL << 5)
 #define IA32_CR4_GLOBAL_PAGES			(1UL << 7)
 
 // Memory type ranges