diff --git a/shell/browser/electron_browser_main_parts.h b/shell/browser/electron_browser_main_parts.h
index 7c8578c957b20..76d5d2d0774fc 100644
--- a/shell/browser/electron_browser_main_parts.h
+++ b/shell/browser/electron_browser_main_parts.h
@@ -130,7 +130,7 @@ class ElectronBrowserMainParts : public content::BrowserMainParts {
   void FreeAppDelegate();
   void RegisterURLHandler();
   void InitializeMainNib();
-  std::string GetCurrentSystemLocale();
+  static std::string GetCurrentSystemLocale();
 #endif
 
 #if BUILDFLAG(IS_MAC)