diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 8713dfec17..2477b55c53 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -13234,8 +13234,8 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
     case 0x7f: /* FSQRT (vector) */
         break;
     default:
-        fprintf(stderr, "%s: insn 0x%04x fpop 0x%2x\n", __func__, insn, fpop);
-        g_assert_not_reached();
+        unallocated_encoding(s);
+        return;
     }