diff --git a/src/codegen.cpp b/src/codegen.cpp
index 8776f91..cc71be8 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -231,12 +231,17 @@ namespace AST {
 
             int counter = 0;
             for (auto& param : this->m_params) {
-                auto param_ty_ptr = param_ty_ptrs[counter];
+                builder.builder->SetInsertPoint(BB);
+                auto arg_ptr = builder.builder->CreateAlloca(param_ty_ptrs[counter]->codegen(builder));
+                auto param_ty_ptr = std::shared_ptr<types::Type>{
+                    new types::PointerType { param_ty_ptrs[counter]}
+                };
                 auto arg = function->getArg(counter++);
+                builder.builder->CreateStore(arg, arg_ptr);
                 if (param.first) {
                     arg->setName(*param.first);
                     inner_scope.values[*param.first] = codegen::StackValue{
-                        arg,
+                        arg_ptr,
                         param_ty_ptr,
                     };
                 }
diff --git a/test.c b/test.c
index cf3f89a..55eb5e0 100644
--- a/test.c
+++ b/test.c
@@ -6,10 +6,13 @@ int fibonacci(int n) {
     return fibonacci(n - 1) + fibonacci(n - 2);
 }
 
+void modifyvalue(char* otus) {
+    (*otus) = 20;
+}
+
 int main() {
     printf("10th fibonacci number is %d!", fibonacci(10));
-    char res = 0;
-    char* test = &res;
-    (*test) = 20;
+    char res = 10;
+    modifyvalue(&res);
     return res;
 }
\ No newline at end of file