diff --git a/lib/gui_rpc_client.h b/lib/gui_rpc_client.h
index a4015cacd3..c03080f97d 100644
--- a/lib/gui_rpc_client.h
+++ b/lib/gui_rpc_client.h
@@ -809,7 +809,9 @@ struct RPC {
 
 #elif defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_4)
 // uselocale() is not available in OS 10.3.9 so use weak linking
+#if HAVE_XLOCALE_H
 #include <xlocale.h>
+#endif
 extern int		freelocale(locale_t) __attribute__((weak_import));
 extern locale_t	newlocale(int, __const char *, locale_t) __attribute__((weak_import));
 extern locale_t	uselocale(locale_t) __attribute__((weak_import));