diff --git a/miosix/config/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/board_settings.h b/miosix/config/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/board_settings.h
index d33881ab461f38d48bea8cca6f68ce3bf81e3672..5720a7dfb69ffad35e82a67b64b0431cd974ee26 100644
--- a/miosix/config/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/board_settings.h
+++ b/miosix/config/arch/cortexM4_stm32f4/stm32f407vg_stm32f4discovery/board_settings.h
@@ -30,6 +30,8 @@
 
 #include "util/version.h"
 
+#define USE_CSTIMER //FIXME: remove when cstimer becomes default
+
 /**
  * \internal
  * Versioning for board_settings.h for out of git tree projects
diff --git a/miosix/config/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/board_settings.h b/miosix/config/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/board_settings.h
index 5223555d1e22cce0ee94e8bac76028f9a1242c65..e92c9e20a09f0ecfadcd22c788b98fb6a9857a1c 100644
--- a/miosix/config/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/board_settings.h
+++ b/miosix/config/arch/cortexM4_stm32f4/stm32f429zi_stm32f4discovery/board_settings.h
@@ -30,8 +30,6 @@
 
 #include "util/version.h"
 
-#define USE_CSTIMER
-
 /**
  * \internal
  * Versioning for board_settings.h for out of git tree projects