diff --git a/demos/ARMCM3-STM32F103-GCC/chconf.h b/demos/ARMCM3-STM32F103-GCC/chconf.h
index 72407ff5b..cb606580b 100644
--- a/demos/ARMCM3-STM32F103-GCC/chconf.h
+++ b/demos/ARMCM3-STM32F103-GCC/chconf.h
@@ -368,7 +368,7 @@
  *       may not be implemented at all.
  */
 #if !defined(CH_DBG_ENABLE_STACK_CHECK) || defined(__DOXYGEN__)
-#define CH_DBG_ENABLE_STACK_CHECK       TRUE
+#define CH_DBG_ENABLE_STACK_CHECK       FALSE
 #endif
 
 /**
@@ -376,7 +376,7 @@
  * pattern when a thread is created.
  */
 #if !defined(CH_DBG_FILL_THREADS) || defined(__DOXYGEN__)
-#define CH_DBG_FILL_THREADS             TRUE
+#define CH_DBG_FILL_THREADS             FALSE
 #endif
 
 /**