diff --git a/sys/arm64/arm64/identcpu.c b/sys/arm64/arm64/identcpu.c
--- a/sys/arm64/arm64/identcpu.c
+++ b/sys/arm64/arm64/identcpu.c
@@ -1821,12 +1821,12 @@
 	for (int i = 0; i < nitems(user_regs); i++) {
 		if (user_regs[i].reg == reg) {
 			val = CPU_DESC_FIELD(kern_cpu_desc, i);
-			*valp = 0;
 			fields = user_regs[i].fields;
 			for (int j = 0; fields[j].type != 0; j++) {
-				*valp |= update_lower_register(mask, val,
+				mask = update_lower_register(mask, val,
 				    fields[j].shift, 4, fields[j].sign);
 			}
+			*valp = mask;
 			return (true);
 		}
 	}