diff --git a/src/node.cc b/src/node.cc
index b72cfcd5..7b5eba84 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -19,19 +19,20 @@ Node::Impl::Impl(const std::string& id_, const std::string& name_, const Halide:
 void Node::set_iport(const std::vector<Port>& ports) {
 
     size_t i = 0;
-    for (const auto& info : impl_->arginfos) {
-        if (info.dir == Halide::Internal::ArgInfoDirection::Output) {
-            continue;
-        }
-
-        if (i >= ports.size()) {
-            log::error("Port {} is out of range", i);
-            throw std::runtime_error("Failed to validate input port");
-        }
+    for (auto& port : ports) {
+        // TODO: Validation is better to be done lazily after BuildingBlock::configure
+        //
+        // if (info.dir == Halide::Internal::ArgInfoDirection::Output) {
+        //     continue;
+        // }
 
-        auto& port(ports[i]);
+        // if (i >= ports.size()) {
+        //     log::error("Port {} is out of range", i);
+        //     throw std::runtime_error("Failed to validate input port");
+        // }
 
-        port.impl_->succ_chans.insert({id(), info.name});
+        // NOTE: Is succ_chans name OK to be just leave as it is?
+        port.impl_->succ_chans.insert({id(), "_ion_iport_" + i});
 
         impl_->ports.push_back(port);
 
@@ -40,11 +41,13 @@ void Node::set_iport(const std::vector<Port>& ports) {
 }
 
 Port Node::operator[](const std::string& name) {
-        if (std::find_if(impl_->arginfos.begin(), impl_->arginfos.end(),
-                         [&](const Halide::Internal::AbstractGenerator::ArgInfo& info) { return info.name == name; }) == impl_->arginfos.end()) {
-            log::error("Port {} is not found", name);
-            throw std::runtime_error("Failed to find port");
-        }
+        // TODO: Validation is better to be done lazily after BuildingBlock::configure
+        //
+        // if (std::find_if(impl_->arginfos.begin(), impl_->arginfos.end(),
+        //                  [&](const Halide::Internal::AbstractGenerator::ArgInfo& info) { return info.name == name; }) == impl_->arginfos.end()) {
+        //     log::error("Port {} is not found", name);
+        //     throw std::runtime_error("Failed to find port");
+        // }
 
         auto it = std::find_if(impl_->ports.begin(), impl_->ports.end(),
                                [&](const Port& p){ return (p.pred_name() == name && p.pred_id() == impl_->id) || p.has_succ({impl_->id, name}); });
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index cb84f929..750790ee 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -61,6 +61,9 @@ endif()
 # Duplicate name test
 ion_jit_executable(dup-port-name SRCS dup-port-name.cc)
 
+# BuildingBlock::configure
+ion_jit_executable(configure SRCS configure.cc)
+
 # Export test
 # TODO: Resolve defects in feature/win-debug branch on Windows environment
 # ion_jit_executable(export SRCS export.cc)
diff --git a/test/configure.cc b/test/configure.cc
new file mode 100644
index 00000000..8df16a4a
--- /dev/null
+++ b/test/configure.cc
@@ -0,0 +1,78 @@
+#include <ion/ion.h>
+
+using namespace ion;
+
+struct Test : BuildingBlock<Test> {
+    // This Building Block takes 1 input, 1 output and 1 parameter.
+    Input<Halide::Func> input{"input", Int(32), 1};
+    Output<Halide::Func> output{"output", Int(32), 1};
+    std::vector<Input<int32_t> *> extra_scalar_inputs;
+    GeneratorParam<int32_t> num{"num", 0};
+
+    void configure() {
+        for (int32_t i=0; i<num; ++i) {
+            extra_scalar_inputs.push_back(add_input<int32_t>("extra_scalar_input_" + std::to_string(i)));
+        }
+    }
+
+    void generate() {
+        Halide::Var i;
+        Halide::Expr v = input(i);
+        for (int i=0; i<num; ++i) {
+            v += *extra_scalar_inputs[i];
+        }
+        output(i) = v;
+    }
+};
+ION_REGISTER_BUILDING_BLOCK(Test, test);
+
+int main() {
+    try {
+        int32_t v = 1;
+        auto size = 4;
+
+        Buffer<int32_t> input{size};
+        input.fill(40);
+
+        // No extra
+        {
+            Builder b;
+            b.set_target(get_host_target());
+            Buffer<int32_t> output{size};
+            b.add("test")(input)["output"].bind(output);
+            b.run();
+            for (int i=0; i<size; ++i) {
+                if (output(i) != 40) {
+                    return 1;
+                }
+            }
+        }
+
+        // Added Extra
+        {
+            Builder b;
+            b.set_target(get_host_target());
+            Buffer<int32_t> output{size};
+            b.add("test")(input, &v, &v).set_param(Param("num", 2))["output"].bind(output);
+            b.compile("x");
+            b.run();
+            for (int i=0; i<size; ++i) {
+                if (output(i) != 42) {
+                    return 1;
+                }
+            }
+        }
+
+    } catch (Halide::Error& e) {
+        std::cerr << e.what() << std::endl;
+        return 1;
+    } catch (const std::exception& e) {
+        std::cerr << e.what() << std::endl;
+        return 1;
+    }
+
+    std::cout << "Passed" << std::endl;
+
+    return 0;
+
+}