diff --git a/dnn/src/fallback/conv_bias/im2col/algos.cpp b/dnn/src/fallback/conv_bias/im2col/algos.cpp
index 30cde32f204ae2c9ba98c463eec854b7f2c6a9c4..7bb81af5a5fdcc21e9eb175fd203f511b5cafa6a 100644
--- a/dnn/src/fallback/conv_bias/im2col/algos.cpp
+++ b/dnn/src/fallback/conv_bias/im2col/algos.cpp
@@ -377,6 +377,15 @@ bool ConvBiasImpl::AlgoIm2col::usable(
         }
 #endif
 
+        //! 8x8x32 and 8x8x8 and NO_PACK is not supported
+        if (matmul_desc.packmode == Pack_Mode::NO_PACK &&
+            param.src_type.enumv() == DTypeEnum::QuantizedS8 &&
+            param.bias_type.enumv() == DTypeEnum::QuantizedS32 &&
+            (param.dst_type.enumv() == DTypeEnum::QuantizedS8 ||
+             param.dst_type.enumv() == DTypeEnum::QuantizedS32)) {
+            return false;
+        }
+
         //! make sure 8x8x16 and 8x8x32 biasmode is  nobias and nonlineMode is
         //! identity otherwise return false mean that 8x8x32 and 8x8x16 not
         //! support PostProcess
diff --git a/dnn/test/x86/conv_bias.cpp b/dnn/test/x86/conv_bias.cpp
index 61bf264758e791cbada326839834810a20426851..333ac6e8fddf6fc82b70d7f55a9982196b04a749 100644
--- a/dnn/test/x86/conv_bias.cpp
+++ b/dnn/test/x86/conv_bias.cpp
@@ -963,7 +963,7 @@ TEST_F(X86_MULTI_THREADS, CONV_BIAS_IM2COLMATMUL_INT8X8X32_FILTER_PREPROCESS) {
 
 #if MEGDNN_X86_WITH_MKL_DNN
     if (megdnn::x86::is_supported(x86::SIMDType::VNNI)) {
-        cb("IM2COLMATMUL:X86_INT8X8X32_MKLDNN");
+        cb("IM2COLMATMUL");
     }
 #endif
 #if MEGDNN_X86_WITH_VNNI