diff --git a/boinc/clientgui/AsyncRPC.cpp b/boinc/clientgui/AsyncRPC.cpp
index f196ced..1d3a70e 100644
--- a/boinc/clientgui/AsyncRPC.cpp
+++ b/boinc/clientgui/AsyncRPC.cpp
@@ -20,7 +20,7 @@
 #endif
 
 #if !(defined(_WIN32) || (defined(__WXMAC__) && (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_4)))
-#include <xlocale.h>
+#include <locale.h>
 #endif
 
 #include "stdwx.h"
diff --git a/boinc/lib/gui_rpc_client.h b/boinc/lib/gui_rpc_client.h
index fda40d0..bb9102a 100644
--- a/boinc/lib/gui_rpc_client.h
+++ b/boinc/lib/gui_rpc_client.h
@@ -807,7 +807,7 @@ 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
-#include <xlocale.h>
+#include <locale.h>
 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));