diff --git a/PowerEditor/src/MISC/Common/Common.cpp b/PowerEditor/src/MISC/Common/Common.cpp
index 9578cf72..1580924c 100644
--- a/PowerEditor/src/MISC/Common/Common.cpp
+++ b/PowerEditor/src/MISC/Common/Common.cpp
@@ -718,7 +718,7 @@ generic_string stringReplace(generic_string subject, const generic_string& searc
 	return subject;
 }
 
-std::vector<generic_string> stringSplit(const generic_string& input, generic_string delimiter)
+std::vector<generic_string> stringSplit(const generic_string& input, const generic_string &delimiter)
 {
 	auto start = 0U;
 	auto end = input.find(delimiter);
@@ -734,7 +734,7 @@ std::vector<generic_string> stringSplit(const generic_string& input, generic_str
 	return output;
 }
 
-generic_string stringJoin(const std::vector<generic_string> &strings, generic_string separator)
+generic_string stringJoin(const std::vector<generic_string> &strings, const generic_string &separator)
 {
 	generic_string joined;
 	size_t length = strings.size();
diff --git a/PowerEditor/src/MISC/Common/Common.h b/PowerEditor/src/MISC/Common/Common.h
index 43bc0e6a..4176a2ca 100644
--- a/PowerEditor/src/MISC/Common/Common.h
+++ b/PowerEditor/src/MISC/Common/Common.h
@@ -188,7 +188,7 @@ generic_string PathAppend(generic_string &strDest, const generic_string & str2ap
 COLORREF getCtrlBgColor(HWND hWnd);
 generic_string stringToUpper(generic_string strToConvert);
 generic_string stringReplace(generic_string subject, const generic_string& search, const generic_string& replace);
-std::vector<generic_string> stringSplit(const generic_string& input, generic_string delimiter);
-generic_string stringJoin(const std::vector<generic_string> &strings, generic_string separator);
+std::vector<generic_string> stringSplit(const generic_string& input, const generic_string &delimiter);
+generic_string stringJoin(const std::vector<generic_string> &strings, const generic_string &separator);
 
 #endif //M30_IDE_COMMUN_H