diff --git a/libraries/AP_HAL_ChibiOS/hwdef/ZubaxGNSS/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/ZubaxGNSS/hwdef.dat
index cefa621555..f3484cc849 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/ZubaxGNSS/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/ZubaxGNSS/hwdef.dat
@@ -115,8 +115,8 @@ define NO_DATAFLASH TRUE
 define DMA_RESERVE_SIZE 0
 
 define PERIPH_FW TRUE
-MAIN_STACK 0x300
-PROCESS_STACK 0x500
+MAIN_STACK 0x100
+PROCESS_STACK 0x600
 define HAL_DISABLE_LOOP_DELAY
 
 define HAL_USE_I2C TRUE