diff --git a/src/layer/riscv/convolution_riscv.cpp b/src/layer/riscv/convolution_riscv.cpp
index 87967d4e8..c62f3f829 100644
--- a/src/layer/riscv/convolution_riscv.cpp
+++ b/src/layer/riscv/convolution_riscv.cpp
@@ -268,25 +268,7 @@ int Convolution_riscv::forward(const Mat& bottom_blob, Mat& top_blob, const Opti
 
     if (bottom_blob.dims != 3)
     {
-        Mat bottom_blob_unpacked = bottom_blob;
-        if (bottom_blob.elempack != 1)
-        {
-            Option opt_pack1 = opt;
-            opt_pack1.blob_allocator = opt.workspace_allocator;
-
-            convert_packing(bottom_blob, bottom_blob_unpacked, 1, opt_pack1);
-        }
-
-        Mat bottom_blob_unpacked_fp32 = bottom_blob_unpacked;
-        if (bottom_blob_unpacked.elembits() == 16)
-        {
-            Option opt_pack1 = opt;
-            opt_pack1.blob_allocator = opt.workspace_allocator;
-
-            cast_float16_to_float32(bottom_blob_unpacked, bottom_blob_unpacked_fp32, opt_pack1);
-        }
-
-        return Convolution::forward(bottom_blob_unpacked_fp32, top_blob, opt);
+        return Convolution::forward(bottom_blob, top_blob, opt);
     }
 
     int elembits = bottom_blob.elembits();