diff --git a/lib_xua/src/core/support/reboot.xc b/lib_xua/src/core/support/reboot.xc
index 280b0b44..19fce62b 100644
--- a/lib_xua/src/core/support/reboot.xc
+++ b/lib_xua/src/core/support/reboot.xc
@@ -12,7 +12,7 @@
 #if (XUD_SERIES_SUPPORT == 4)
 #include "xs2_su_registers.h"
 #define XS2_SU_PERIPH_USB_ID 0x1
-#define PLL_MASK 0x7FFFFFFF
+#define PLL_MASK 0x3FFFFFFF
 #else
 #define PLL_MASK 0xFFFFFFFF
 #endif