diff --git a/include/Utils/StringUtils.h b/include/Utils/StringUtils.h
index b2c52464..2bf412cc 100644
--- a/include/Utils/StringUtils.h
+++ b/include/Utils/StringUtils.h
@@ -22,7 +22,7 @@ String deleteToMarkerLast(String str, String found);
 
 String selectFromMarkerToMarker(String str, String found, int number);
 
-size_t itemsCount2(String& str, const String& separator);
+size_t itemsCount2(String str, const String& separator);
 
 size_t itemsCount(String& str, const char* delim);
 
diff --git a/src/Utils/StringUtils.cpp b/src/Utils/StringUtils.cpp
index 765424d8..08ec5fa9 100644
--- a/src/Utils/StringUtils.cpp
+++ b/src/Utils/StringUtils.cpp
@@ -76,7 +76,7 @@ uint16_t hexStringToUint16(String hex) {
     }
 }
 
-size_t itemsCount2(String& str, const String& separator) {
+size_t itemsCount2(String str, const String& separator) {
     // если строки поиск нет сразу выход
     if (str.indexOf(separator) == -1) {
         return 0;