diff --git a/qemu/target/arm/translate-a64.c b/qemu/target/arm/translate-a64.c
index 9bd22326..64cbc152 100644
--- a/qemu/target/arm/translate-a64.c
+++ b/qemu/target/arm/translate-a64.c
@@ -12851,7 +12851,7 @@ static void disas_simd_indexed(DisasContext *s, uint32_t insn)
 
     case 2: /* complex fp */
         /* Each indexable element is a complex pair.  */
-        size <<= 1;
+        size += 1;
         switch (size) {
         case MO_32:
             if (h && !is_q) {