diff --git a/unit_tests/logicdata_csv_reader.cpp b/unit_tests/logicdata_csv_reader.cpp
index 2ca6d751ac..e68e3fdd62 100644
--- a/unit_tests/logicdata_csv_reader.cpp
+++ b/unit_tests/logicdata_csv_reader.cpp
@@ -20,7 +20,7 @@ static char* trim(char *str) {
 	return str;
 }
 
-void CsvReader::open(char *fileName, int *columnIndeces) {
+void CsvReader::open(const char *fileName, int *columnIndeces) {
 	fp = fopen(fileName, "r");
 	this->columnIndeces = columnIndeces;
 	ASSERT_TRUE(fp != nullptr);
diff --git a/unit_tests/logicdata_csv_reader.h b/unit_tests/logicdata_csv_reader.h
index f2886e07b1..f8f61c0cef 100644
--- a/unit_tests/logicdata_csv_reader.h
+++ b/unit_tests/logicdata_csv_reader.h
@@ -19,7 +19,7 @@ public:
 
 	int * columnIndeces;
 
-	void open(char *fileName, int * columnIndeces);
+	void open(const char *fileName, int * columnIndeces);
 	bool haveMore();
 	void processLine(EngineTestHelper *eth);
 	void readLine(EngineTestHelper *eth);