diff --git a/src/core/excelreader.cpp b/src/core/excelreader.cpp
index 14ee63c..0cbf9b3 100644
--- a/src/core/excelreader.cpp
+++ b/src/core/excelreader.cpp
@@ -2,7 +2,7 @@
 
 #include <xlnt/xlnt.hpp>
 
-void ExcelReader::readSellersFromFile(std::filesystem::path& filePath, Marketplace* market)
+void ExcelReader::readSellersFromFile(const std::filesystem::path& filePath, Marketplace* market)
 {
     for (auto& seller : market->getSellers()) {
         seller->setState(Seller::State::DELETE);
diff --git a/src/core/excelreader.h b/src/core/excelreader.h
index 1d8b945..8071e04 100644
--- a/src/core/excelreader.h
+++ b/src/core/excelreader.h
@@ -12,7 +12,7 @@
 class ExcelReader
 {
   public:
-    static void readSellersFromFile(std::filesystem::path& filePath, Marketplace* market);
+    static void readSellersFromFile(const std::filesystem::path& filePath, Marketplace* market);
 };
 
 #endif
\ No newline at end of file