diff --git a/src/Script.cpp b/src/Script.cpp
index 67a7fd3..0a1c055 100644
--- a/src/Script.cpp
+++ b/src/Script.cpp
@@ -25,7 +25,7 @@ Porygon::Script::Script(const u16string& s, ScriptOptions* options)
     :   Diagnostics(make_shared<Diagnostics::DiagnosticsHolder>(s)),
         _boundScript(nullptr),
         _scriptVariables(new map<Utilities::HashedString, EvalValuePointer>()),
-        _scriptTypes(new unordered_map<Utilities::HashedString, shared_ptr<ScriptType>>{}),
+        _scriptTypes(new unordered_map<Utilities::HashedString, shared_ptr<const ScriptType>>{}),
         _scriptOptions(options)
 {
     _evaluator = new Evaluator(this -> _scriptVariables, this -> GetScriptOptions());
@@ -63,7 +63,7 @@ void Porygon::Script::Parse(const u16string& script) {
             delete v.second;
         }
         for (const auto& v : variableTypes){
-            this->_scriptTypes -> insert({v.first, nullptr});
+            this->_scriptTypes -> insert({v.first, v.second});
         }
         scriptScope.clear();
         variableTypes.clear();
@@ -109,7 +109,7 @@ Porygon::Script::Script(shared_ptr<BoundScriptStatement> boundScript,
                         : _boundScript(std::move(boundScript)),
                           Diagnostics(std::move(diagnostics)),
                           _scriptVariables(new map<Utilities::HashedString, EvalValuePointer>()),
-                          _scriptTypes(new unordered_map<Utilities::HashedString, shared_ptr<ScriptType>>{}),
+                          _scriptTypes(new unordered_map<Utilities::HashedString, shared_ptr<const ScriptType>>{}),
                           _scriptOptions(nullptr)
                         {
     _evaluator = new Evaluator(_scriptVariables, this -> GetScriptOptions());
diff --git a/src/Script.hpp b/src/Script.hpp
index aa776e6..5ee8702 100644
--- a/src/Script.hpp
+++ b/src/Script.hpp
@@ -19,7 +19,7 @@ namespace Porygon{
     class Script {
         Evaluator* _evaluator;
         map<Utilities::HashedString, EvalValuePointer>* _scriptVariables;
-        unordered_map<Utilities::HashedString, shared_ptr<ScriptType>>* _scriptTypes;
+        unordered_map<Utilities::HashedString, shared_ptr<const ScriptType>>* _scriptTypes;
         shared_ptr<Binder::BoundScriptStatement> _boundScript;
         shared_ptr<const ScriptType> _returnType = nullptr;
         ScriptOptions* _scriptOptions;
diff --git a/tests/integration/ModuleTests.cpp b/tests/integration/ModuleTests.cpp
index 309c805..382e23a 100644
--- a/tests/integration/ModuleTests.cpp
+++ b/tests/integration/ModuleTests.cpp
@@ -24,7 +24,14 @@ local module = {
 }
 return module
 )")
-                }
+                },
+                {"simple_no_return", Script::Create(u"foo = 500")},
+                {"no_return_with_local", Script::Create(uR"(
+local foo = 684
+function bar()
+    return foo
+end
+)")},
             };
         }
 
@@ -106,5 +113,31 @@ return list.contains({"foo", "bar"}, "bar")
     delete script;
 }
 
+TEST_CASE( "Simple no return module", "[integration]" ) {
+    ModuleHandler::Initialize();
+    auto script = Script::Create(uR"(
+require("simple_no_return")
+return foo
+)");
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    auto result = script->Evaluate();
+    CHECK(result->EvaluateInteger() == 500);
+
+    delete script;
+}
+
+TEST_CASE( "Simple no return module with local variable", "[integration]" ) {
+    ModuleHandler::Initialize();
+    auto script = Script::Create(uR"(
+require("no_return_with_local")
+return bar()
+)");
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    auto result = script->Evaluate();
+    CHECK(result->EvaluateInteger() == 684);
+
+    delete script;
+}
+
 
 #endif