diff --git a/repertory/librepertory/include/platform/platform.hpp b/repertory/librepertory/include/platform/platform.hpp
index cafa2eba..99ff62cf 100644
--- a/repertory/librepertory/include/platform/platform.hpp
+++ b/repertory/librepertory/include/platform/platform.hpp
@@ -26,7 +26,7 @@
 
 namespace repertory {
 [[nodiscard]] auto create_lock_id(provider_type prov,
-                                  std::string_view unique_id);
+                                  std::string_view unique_id)->std::string;
 }
 
 #if defined(_WIN32)
diff --git a/repertory/librepertory/src/utils/platform.cpp b/repertory/librepertory/src/utils/platform.cpp
index b7867a7d..fc497d3b 100644
--- a/repertory/librepertory/src/utils/platform.cpp
+++ b/repertory/librepertory/src/utils/platform.cpp
@@ -24,7 +24,7 @@
 #include "app_config.hpp"
 
 namespace repertory {
-auto create_lock_id(provider_type prov, std::string_view unique_id) {
+auto create_lock_id(provider_type prov, std::string_view unique_id)->std::string {
   return fmt::format("{}_{}_{}", REPERTORY_DATA_NAME,
                      app_config::get_provider_name(prov), unique_id);
 }