diff --git a/arch/arm/include/asm/proc-armv/ptrace.h b/arch/arm/include/asm/proc-armv/ptrace.h
index 71df5a9e253809e9baa95afa29724972ea447e16..183b00a08719fb8a9c024303d5f8ec086d5f545f 100644
--- a/arch/arm/include/asm/proc-armv/ptrace.h
+++ b/arch/arm/include/asm/proc-armv/ptrace.h
@@ -37,6 +37,7 @@ struct pt_regs {
 #define FIQ_MODE	0x11
 #define IRQ_MODE	0x12
 #define SVC_MODE	0x13
+#define MON_MODE	0x16
 #define ABT_MODE	0x17
 #define HYP_MODE	0x1a
 #define UND_MODE	0x1b