diff --git a/src/layer/x86/mish_x86.cpp b/src/layer/x86/mish_x86.cpp
index e55a5e1f8..90ce135c1 100644
--- a/src/layer/x86/mish_x86.cpp
+++ b/src/layer/x86/mish_x86.cpp
@@ -31,64 +31,8 @@ int Mish_x86::forward_inplace(Mat& bottom_top_blob, const Option& opt) const
     int h = bottom_top_blob.h;
     int d = bottom_top_blob.d;
     int channels = bottom_top_blob.c;
-    int size = w * h * d;
-#if __SSE2__
     int elempack = bottom_top_blob.elempack;
-
-#if __AVX__
-#if __AVX512F__
-    if (elempack == 16)
-    {
-        Mat tmp;
-        convert_packing(bottom_top_blob, tmp, 8, opt);
-
-        forward_inplace(tmp, opt);
-
-        convert_packing(tmp, bottom_top_blob, 16, opt);
-
-        return 0;
-    }
-#endif // __AVX512F__
-
-    if (elempack == 8)
-    {
-        #pragma omp parallel for num_threads(opt.num_threads)
-        for (int q = 0; q < channels; q++)
-        {
-            float* ptr = bottom_top_blob.channel(q);
-
-            for (int i = 0; i < size; i++)
-            {
-                __m256 _p = _mm256_loadu_ps(ptr);
-                _p = mish_avx(_p);
-                _mm256_storeu_ps(ptr, _p);
-                ptr += 8;
-            }
-        }
-
-        return 0;
-    }
-#endif // __AVX__
-
-    if (elempack == 4)
-    {
-        #pragma omp parallel for num_threads(opt.num_threads)
-        for (int q = 0; q < channels; q++)
-        {
-            float* ptr = bottom_top_blob.channel(q);
-
-            for (int i = 0; i < size; i++)
-            {
-                __m128 _p = _mm_loadu_ps(ptr);
-                _p = mish_sse(_p);
-                _mm_storeu_ps(ptr, _p);
-                ptr += 4;
-            }
-        }
-
-        return 0;
-    }
-#endif // __SSE2__
+    int size = w * h * d * elempack;
 
     #pragma omp parallel for num_threads(opt.num_threads)
     for (int q = 0; q < channels; q++)
@@ -98,6 +42,15 @@ int Mish_x86::forward_inplace(Mat& bottom_top_blob, const Option& opt) const
         int i = 0;
 #if __SSE2__
 #if __AVX__
+#if __AVX512F__
+        for (; i + 15 < size; i += 16)
+        {
+            __m512 _p = _mm512_loadu_ps(ptr);
+            _p = mish_avx512(_p);
+            _mm512_storeu_ps(ptr, _p);
+            ptr += 16;
+        }
+#endif
         for (; i + 7 < size; i += 8)
         {
             __m256 _p = _mm256_loadu_ps(ptr);