diff --git a/src/context/ConstantContext.tsx b/src/context/ConstantContext.tsx
index bcd290deb..8dc457a6a 100644
--- a/src/context/ConstantContext.tsx
+++ b/src/context/ConstantContext.tsx
@@ -80,7 +80,7 @@ export const ConstantStateProvider = (props: PropsWithChildren<ConstantContextPr
           ...initialState.messageInputControls,
           ...props.messageInputControls,
         },
-        locale: props.locale,
+        locale: props.locale ?? navigator.language,
         dateLocale: props.dateLocale ?? initialState.dateLocale,
         // ----- Feature flag props ----- //
         autoOpen: props.autoOpen,