diff --git a/bsp/cvitek/cv18xx_risc-v/rtconfig.py b/bsp/cvitek/cv18xx_risc-v/rtconfig.py
index 18a281e125e..5615b98feea 100755
--- a/bsp/cvitek/cv18xx_risc-v/rtconfig.py
+++ b/bsp/cvitek/cv18xx_risc-v/rtconfig.py
@@ -46,6 +46,7 @@
     LFLAGS  = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,_start -T link.lds.generated' + ' -lsupc++ -lgcc -static'
     CPATH   = ''
     LPATH   = ''
+    CFLAGS += ' -DCONFIG_XUANTIE_SVPBMT '
 
     if BUILD == 'debug':
         CFLAGS += ' -O0 -ggdb'