diff --git a/include/verilogAST.hpp b/include/verilogAST.hpp
index 903e3d1..a5d83dd 100644
--- a/include/verilogAST.hpp
+++ b/include/verilogAST.hpp
@@ -580,8 +580,9 @@ class InlineVerilog : public StructuralStatement {
   ~InlineVerilog(){};
 };
 
-typedef std::vector<
-    std::pair<std::unique_ptr<Identifier>, std::unique_ptr<Expression>>>
+typedef std::vector<std::pair<
+    std::variant<std::unique_ptr<Identifier>, std::unique_ptr<Vector>>,
+    std::unique_ptr<Expression>>>
     Parameters;
 
 typedef std::vector<std::pair<std::string, std::unique_ptr<Expression>>>
diff --git a/src/verilogAST.cpp b/src/verilogAST.cpp
index 03dee2f..b7d03fb 100644
--- a/src/verilogAST.cpp
+++ b/src/verilogAST.cpp
@@ -343,7 +343,7 @@ std::string Module::emitModuleHeader() {
     module_header_str += " #(\n    ";
     std::vector<std::string> param_strs;
     for (auto &it : parameters) {
-      param_strs.push_back("parameter " + it.first->toString() + " = " +
+      param_strs.push_back("parameter " + variant_to_string(it.first) + " = " +
                            it.second->toString());
     }
     module_header_str += join(param_strs, ",\n    ");
@@ -389,7 +389,7 @@ std::string ModuleInstantiation::toString() {
     module_inst_str += " #(\n    ";
     std::vector<std::string> param_strs;
     for (auto &it : parameters) {
-      param_strs.push_back("." + it.first->toString() + "(" +
+      param_strs.push_back("." + variant_to_string(it.first) + "(" +
                            it.second->toString() + ")");
     }
     module_inst_str += join(param_strs, ",\n    ");
diff --git a/tests/basic.cpp b/tests/basic.cpp
index 935a9e3..fb4273b 100644
--- a/tests/basic.cpp
+++ b/tests/basic.cpp
@@ -330,11 +330,17 @@ TEST(BasicTests, TestModule) {
   std::string name = "test_module";
 
   vAST::Parameters parameters;
+  parameters.push_back(std::make_pair(
+      std::make_unique<vAST::Vector>(vAST::make_id("param1"),
+                                     vAST::make_num("3"), vAST::make_num("0")),
+      vAST::make_num("1")));
   vAST::Module module(name, make_simple_ports(), make_simple_body(),
                       std::move(parameters));
 
   std::string expected_str =
-      "module test_module (\n"
+      "module test_module #(\n"
+      "    parameter [3:0] param1 = 1\n"
+      ") (\n"
       "    input i,\n"
       "    output o\n"
       ");\n"