diff --git a/compiler/luci/import/include/luci/ImporterEx.h b/compiler/luci/import/include/luci/ImporterEx.h
index e00712c724c..52d808a92d1 100644
--- a/compiler/luci/import/include/luci/ImporterEx.h
+++ b/compiler/luci/import/include/luci/ImporterEx.h
@@ -50,7 +50,7 @@ class ImporterEx final
   // embedded-import-value-test uses constant data from file(actually ROM)
   // so unloading file will break the precondition
   // TODO remove this after embedded-import-value-test has moved to onert-micro
-  std::unique_ptr<Module> importModule(std::vector<char> &model_data) const;
+  std::unique_ptr<Module> importModule(const std::vector<char> &model_data) const;
 
 private:
   const GraphBuilderSource *_source = nullptr;
diff --git a/compiler/luci/import/src/ImporterEx.cpp b/compiler/luci/import/src/ImporterEx.cpp
index 88b125f1657..1a67f7a7610 100644
--- a/compiler/luci/import/src/ImporterEx.cpp
+++ b/compiler/luci/import/src/ImporterEx.cpp
@@ -65,9 +65,9 @@ std::unique_ptr<Module> ImporterEx::importVerifyModule(const std::string &input_
   return importer.importModule(data_data, data_size);
 }
 
-std::unique_ptr<Module> ImporterEx::importModule(std::vector<char> &model_data) const
+std::unique_ptr<Module> ImporterEx::importModule(const std::vector<char> &model_data) const
 {
-  auto data_data = reinterpret_cast<uint8_t *>(model_data.data());
+  auto data_data = reinterpret_cast<const uint8_t *>(model_data.data());
   auto data_size = model_data.size();
 
   Importer importer(_source);