diff --git a/sources/inc/constants.h b/sources/inc/constants.h
index af6749c9aeb9f5f18cd14e24be37b8fc53a3cfa9..9970eca85740b80a2591637841fa169a4f8ddc08 100644
--- a/sources/inc/constants.h
+++ b/sources/inc/constants.h
@@ -65,7 +65,7 @@ typedef uint32_t mcu_actuator;
 #define ACTUATOR_0 0 // by default : axis X
 #define ACTUATOR_1 1 // by default : axis Y
 #define ACTUATOR_2 2 // by default : axis Z
-#define ACTUATOR_3 3 // by default : axis A
+#define ACTUATOR_3 5 // by default : axis A
 
 #define MCU_SYSTEM_ACT_MAX_COUNT 4 // total : 4 actuators