diff --git a/flight/PipXtreme/System/inc/FreeRTOSConfig.h b/flight/PipXtreme/System/inc/FreeRTOSConfig.h
index 994956008..0c515b7f7 100755
--- a/flight/PipXtreme/System/inc/FreeRTOSConfig.h
+++ b/flight/PipXtreme/System/inc/FreeRTOSConfig.h
@@ -76,7 +76,7 @@ NVIC value of 255. */
 #endif
 
 /* Enable run time stats collection */
-#if defined(DIAGNOSTICS)
+#if defined(STACK_DIAGNOSTICS)
 #define configCHECK_FOR_STACK_OVERFLOW	2
 
 #define configGENERATE_RUN_TIME_STATS 1