diff --git a/mission/controller/acs/control/SafeCtrl.cpp b/mission/controller/acs/control/SafeCtrl.cpp
index 3a69e343..9ef9acf5 100644
--- a/mission/controller/acs/control/SafeCtrl.cpp
+++ b/mission/controller/acs/control/SafeCtrl.cpp
@@ -94,7 +94,8 @@ ReturnValue_t SafeCtrl::safeNoMekf(timeval now, double *susDirB, bool susDirBVal
   }
 
   // change unit from uT to T
-  VectorOperations<double>::mulScalar(magFieldB, 1e-6, magFieldB, 3);
+  double magFieldBT[3] = {0,0,0};
+  VectorOperations<double>::mulScalar(magFieldB, 1e-6, magFieldBT, 3);
 
   // normalize sunDir and magDir
   double magDirB[3] = {0, 0, 0};