diff --git a/level_zero/core/source/driver/additional_extension_function_address.cpp b/level_zero/core/source/driver/additional_extension_function_address.cpp
index ff1a41e898..e11c3488fa 100644
--- a/level_zero/core/source/driver/additional_extension_function_address.cpp
+++ b/level_zero/core/source/driver/additional_extension_function_address.cpp
@@ -8,7 +8,7 @@
 #include "level_zero/core/source/driver/extension_function_address.h"
 
 namespace L0 {
-void *ExtensionFunctionAddressHelper::getAdditionalExtensionFunctionAddress(std::string functionName) {
+void *ExtensionFunctionAddressHelper::getAdditionalExtensionFunctionAddress(const std::string &functionName) {
     return nullptr;
 }
 
diff --git a/level_zero/core/source/driver/extension_function_address.cpp b/level_zero/core/source/driver/extension_function_address.cpp
index 19818ed9eb..f415677d34 100644
--- a/level_zero/core/source/driver/extension_function_address.cpp
+++ b/level_zero/core/source/driver/extension_function_address.cpp
@@ -13,7 +13,7 @@
 #include <cstring>
 
 namespace L0 {
-void *ExtensionFunctionAddressHelper::getExtensionFunctionAddress(std::string functionName) {
+void *ExtensionFunctionAddressHelper::getExtensionFunctionAddress(const std::string &functionName) {
 #define RETURN_FUNC_PTR_IF_EXIST(name)    \
     {                                     \
         if (functionName == #name) {      \
diff --git a/level_zero/core/source/driver/extension_function_address.h b/level_zero/core/source/driver/extension_function_address.h
index 8d7e97e1e5..1e01efea0d 100644
--- a/level_zero/core/source/driver/extension_function_address.h
+++ b/level_zero/core/source/driver/extension_function_address.h
@@ -12,9 +12,9 @@
 
 namespace L0 {
 struct ExtensionFunctionAddressHelper {
-    static void *getExtensionFunctionAddress(std::string functionName);
+    static void *getExtensionFunctionAddress(const std::string &functionName);
 
   protected:
-    static void *getAdditionalExtensionFunctionAddress(std::string functionName);
+    static void *getAdditionalExtensionFunctionAddress(const std::string &functionName);
 };
 } // namespace L0