diff --git a/src/propagation/model/three-gpp-propagation-loss-model.cc b/src/propagation/model/three-gpp-propagation-loss-model.cc
index 39f294e37..72091f86a 100644
--- a/src/propagation/model/three-gpp-propagation-loss-model.cc
+++ b/src/propagation/model/three-gpp-propagation-loss-model.cc
@@ -263,7 +263,7 @@ ComputeClutterLoss(double freq,
     return loss;
 };
 
-static const double M_C = 3.0e8; //!< propagation velocity in free space
+constexpr double M_C = 3.0e8; //!< propagation velocity in free space
 
 } // namespace