--- src/kernel/sel4/libsel4/arch_include/arm/sel4/arch/types.h
+++ src/kernel/sel4/libsel4/arch_include/arm/sel4/arch/types.h
@@ -24,6 +24,7 @@
 typedef seL4_CPtr seL4_ARM_IOPageTable;
 
 typedef enum {
+    seL4_ARM_Uncacheable   = 0x00,
     seL4_ARM_PageCacheable = 0x01,
     seL4_ARM_ParityEnabled = 0x02,
     seL4_ARM_Default_VMAttributes = 0x03,