diff --git a/qemu/target/arm/cpu64.c b/qemu/target/arm/cpu64.c
index 58a3f238..fee3b428 100644
--- a/qemu/target/arm/cpu64.c
+++ b/qemu/target/arm/cpu64.c
@@ -353,9 +353,9 @@ static void aarch64_max_initfn(struct uc_struct *uc, Object *obj, void *opaque)
     u = FIELD_DP32(u, ID_MMFR4, XNX, 1); /* TTS2UXN */
     cpu->isar.id_mmfr4 = u;
 
-    u = cpu->isar.id_aa64dfr0;
-    u = FIELD_DP64(u, ID_AA64DFR0, PMUVER, 5); /* v8.4-PMU */
-    cpu->isar.id_aa64dfr0 = u;
+    t = cpu->isar.id_aa64dfr0;
+    t = FIELD_DP64(t, ID_AA64DFR0, PMUVER, 5); /* v8.4-PMU */
+    cpu->isar.id_aa64dfr0 = t;
 
     u = cpu->isar.id_dfr0;
     u = FIELD_DP32(u, ID_DFR0, PERFMON, 5); /* v8.4-PMU */