diff --git a/src/modules/navigator/MissionFeasibility/FeasibilityChecker.cpp b/src/modules/navigator/MissionFeasibility/FeasibilityChecker.cpp
index d28ba69917..81e07ad914 100644
--- a/src/modules/navigator/MissionFeasibility/FeasibilityChecker.cpp
+++ b/src/modules/navigator/MissionFeasibility/FeasibilityChecker.cpp
@@ -72,8 +72,8 @@ void FeasibilityChecker::reset()
 
 	_first_waypoint_found = false;
 
-	_last_lat = NAN;
-	_last_lon = NAN;
+	_last_lat = (double)NAN;
+	_last_lon = (double)NAN;
 	_last_cmd = -1;
 }
 
diff --git a/src/modules/navigator/MissionFeasibility/FeasibilityChecker.hpp b/src/modules/navigator/MissionFeasibility/FeasibilityChecker.hpp
index ab9096c595..d7e0403859 100644
--- a/src/modules/navigator/MissionFeasibility/FeasibilityChecker.hpp
+++ b/src/modules/navigator/MissionFeasibility/FeasibilityChecker.hpp
@@ -120,8 +120,8 @@ private:
 	bool _first_waypoint_found{false};
 
 	// internal checkDistancesBetweenWaypoints variables
-	double _last_lat{NAN};
-	double _last_lon{NAN};
+	double _last_lat{(double)NAN};
+	double _last_lon{(double)NAN};
 	int _last_cmd{-1};
 
 	void updateData();