diff --git a/target/arm/helper.c b/target/arm/helper.c
index 72c9c7e694a7aed4fe04d79f094906139390b46d..e868b08cc1894b4037d0514c0203e7e7b0286392 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1017,7 +1017,8 @@ static const ARMCPRegInfo v6_cp_reginfo[] = {
 #define PMCRN_MASK  0xf800
 #define PMCRN_SHIFT 11
 #define PMCRLC  0x40
-#define PMCRDP  0x10
+#define PMCRDP  0x20
+#define PMCRX   0x10
 #define PMCRD   0x8
 #define PMCRC   0x4
 #define PMCRP   0x2