diff --git a/src/core/jsonutil.cpp b/src/core/jsonutil.cpp
index a71168b..9d3bde3 100644
--- a/src/core/jsonutil.cpp
+++ b/src/core/jsonutil.cpp
@@ -106,10 +106,10 @@ void JsonUtil::exportSales(const std::string& filename, Marketplace* market, int
     writer->write(root, &file);
 }
 
-void JsonUtil::importSales(const std::string& filename, Marketplace* market, int cashPointNo)
+void JsonUtil::importSales(const std::filesystem::path& filePath, Marketplace* market, int cashPointNo)
 {
     Json::Value jsonValues;
-    std::ifstream file(filename);
+    std::ifstream file(filePath);
     file >> jsonValues;
 
     int source_no = jsonValues["source_no"].asInt();
diff --git a/src/core/jsonutil.h b/src/core/jsonutil.h
index 50601bf..9ec6ddc 100644
--- a/src/core/jsonutil.h
+++ b/src/core/jsonutil.h
@@ -12,7 +12,7 @@ class JsonUtil
     static void exportSellers(const std::string& filename, Marketplace* market);
     static void importSellers(const std::filesystem::path& filePath, Marketplace* market);
     static void exportSales(const std::string& filename, Marketplace* market, int cashPointNo);
-    static void importSales(const std::string& filename, Marketplace* market, int cashPointNo);
+    static void importSales(const std::filesystem::path& filePath, Marketplace* market, int cashPointNo);
 };
 
 #endif
\ No newline at end of file