diff --git a/tools/pnnx/src/pass_level0/shape_inference.cpp b/tools/pnnx/src/pass_level0/shape_inference.cpp
index c8319d130..e7c2d759e 100644
--- a/tools/pnnx/src/pass_level0/shape_inference.cpp
+++ b/tools/pnnx/src/pass_level0/shape_inference.cpp
@@ -77,6 +77,14 @@ static bool value_link_output(const torch::jit::Value* v, const std::vector<torc
             if (link)
                 return true;
         }
+
+        std::string op_type = node->kind().toDisplayString();
+        bool is_inplace_op = op_type.size() > 2 && op_type[op_type.size() - 2] != '_' && op_type[op_type.size() - 1] == '_';
+        if (is_inplace_op)
+        {
+            // optimize me: track other inplace op inputs
+            return true;
+        }
     }
 
     return false;
diff --git a/tools/pnnx/src/pass_level2.cpp b/tools/pnnx/src/pass_level2.cpp
index 41f366d5e..d951498e7 100644
--- a/tools/pnnx/src/pass_level2.cpp
+++ b/tools/pnnx/src/pass_level2.cpp
@@ -1142,6 +1142,7 @@ static void fix_inplace_copy_output(Graph& graph)
             Operator* op_copy = graph.new_operator_after("aten::copy", op->name + "_copy", op);
             Operand* copy_out = graph.new_operand(op->name + "_copy_out");
 
+            copy_out->type = in0->type;
             copy_out->shape = in0->shape;
 
             op_copy->inputs.push_back(op->inputs[0]);
diff --git a/tools/pnnx/src/pass_level5/fuse_slice_copy.cpp b/tools/pnnx/src/pass_level5/fuse_slice_copy.cpp
index 0a5fabab7..ce5a06710 100644
--- a/tools/pnnx/src/pass_level5/fuse_slice_copy.cpp
+++ b/tools/pnnx/src/pass_level5/fuse_slice_copy.cpp
@@ -177,6 +177,7 @@ void fuse_slice_copy(Graph& graph)
             Operator* op_clone = graph.new_operator_before("Tensor.clone", op->name + "_ncnnclone", top_sop);
             Operand* clone_out = graph.new_operand(op->name + "_ncnnclone_out");
 
+            clone_out->type = top_sop->inputs[0]->type;
             clone_out->shape = top_sop->inputs[0]->shape;
 
             op_clone->inputs.push_back(top_sop->inputs[0]);
@@ -255,6 +256,7 @@ void fuse_slice_copy(Graph& graph)
 
                 op_view->params["shape"] = target_shape;
 
+                view_out->type = op->inputs[1]->type;
                 view_out->shape = target_shape;
 
                 op_view->inputs.push_back(op->inputs[1]);