diff --git a/mission/controller/AcsController.cpp b/mission/controller/AcsController.cpp
index 8a58eb90..2e53d17c 100644
--- a/mission/controller/AcsController.cpp
+++ b/mission/controller/AcsController.cpp
@@ -426,7 +426,7 @@ ReturnValue_t AcsController::checkModeCommand(Mode_t mode, Submode_t submode,
       return INVALID_SUBMODE;
     }
   } else if ((mode == MODE_ON) || (mode == MODE_NORMAL)) {
-    if ((submode > 6) || (submode < 2)) {
+    if ((submode > acs::PTG_TARGET_INERTIAL) || (submode < acs::SAFE)) {
       return INVALID_SUBMODE;
     } else {
       return returnvalue::OK;