diff --git a/host/solver/include/conv_igemm_fwd_v6r1_dlops_nchw_kcyx_nkhw.hpp b/host/solver/include/conv_igemm_fwd_v6r1_dlops_nchw_kcyx_nkhw.hpp
index c1bd754750..b2e14df8f9 100644
--- a/host/solver/include/conv_igemm_fwd_v6r1_dlops_nchw_kcyx_nkhw.hpp
+++ b/host/solver/include/conv_igemm_fwd_v6r1_dlops_nchw_kcyx_nkhw.hpp
@@ -103,7 +103,7 @@ struct CompileParameterConvIgemmFwdV6r1DlopsNchwKcyxNkhw
     ck::DataTypeEnum_t AccDataTypeEnum = ck::DataTypeEnum_t::Unknown;
     ck::DataTypeEnum_t CDataTypeEnum   = ck::DataTypeEnum_t::Unknown;
 
-    int BlockSize = 1;
+    int BlockSize = -1;
 
     int GN0 = -1;
     int GK1 = -1;