diff --git a/src/layer/arm/convolution_arm.cpp b/src/layer/arm/convolution_arm.cpp
index 3933d424c2b..4d379f65eae 100644
--- a/src/layer/arm/convolution_arm.cpp
+++ b/src/layer/arm/convolution_arm.cpp
@@ -1376,11 +1376,13 @@ int Convolution_arm::forward_int8_arm(const Mat& bottom_blob, Mat& top_blob, con
 #if __ARM_NEON
     if (opt.use_packing_layout)
     {
+#if NCNN_ARM82
         if (ncnn::cpu_support_arm_asimdhp() && opt.use_fp16_arithmetic)
         {
             out_elempack_int32 = num_output % 8 == 0 ? 8 : num_output % 4 == 0 ? 4 : 1;
         }
         else
+#endif // NCNN_ARM82
         {
             out_elempack_int32 = num_output % 4 == 0 ? 4 : 1;
         }