diff --git a/contrib/rtos-helpers/FreeRTOS-openocd.c b/contrib/rtos-helpers/FreeRTOS-openocd.c
index 567e710b0..81a3ab77a 100644
--- a/contrib/rtos-helpers/FreeRTOS-openocd.c
+++ b/contrib/rtos-helpers/FreeRTOS-openocd.c
@@ -17,4 +17,4 @@
 #define USED
 #endif
 
-const int USED uxTopUsedPriority = configMAX_PRIORITIES;
+const int USED uxTopUsedPriority = configMAX_PRIORITIES - 1;