diff --git a/src/modules/navigator/mission_feasibility_checker.cpp b/src/modules/navigator/mission_feasibility_checker.cpp
index a30060b27a..a31aa25805 100644
--- a/src/modules/navigator/mission_feasibility_checker.cpp
+++ b/src/modules/navigator/mission_feasibility_checker.cpp
@@ -51,12 +51,6 @@
 #include <errno.h>
 #include <uORB/topics/fence.h>
 
-/* oddly, ERROR is not defined for c++ */
-#ifdef ERROR
-# undef ERROR
-#endif
-static const int ERROR = -1;
-
 MissionFeasibilityChecker::MissionFeasibilityChecker() :
 	_mavlink_fd(-1),
 	_capabilities_sub(-1),