diff --git a/src/c21/FreeRTOSConfig.h b/src/c21/FreeRTOSConfig.h
index f9d681b..7831b9b 100644
--- a/src/c21/FreeRTOSConfig.h
+++ b/src/c21/FreeRTOSConfig.h
@@ -104,7 +104,7 @@
 // <i> if open, you must realize vApplicationTickHook function
 // <id> freertos_use_tick_hook
 #ifndef configUSE_TICK_HOOK
-#define configUSE_TICK_HOOK 0
+#define configUSE_TICK_HOOK 1
 #endif
 
 // <q> Use tickless idle
diff --git a/src/c21/freertos_hooks.c b/src/c21/freertos_hooks.c
index fc7b522..cdf15b1 100644
--- a/src/c21/freertos_hooks.c
+++ b/src/c21/freertos_hooks.c
@@ -55,6 +55,7 @@ extern void vApplicationMallocFailedHook(void)
 	printf("Malloc failed\n");
 }
 
+void vApplicationTickHook(void) __attribute__((weak));
 void vApplicationTickHook(void) {
 }