merging.

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/WarpX.cpp b/Source/WarpX.cpp
index e6c72e9d8..4ea87d6e5 100644
--- a/Source/WarpX.cpp
+++ b/Source/WarpX.cpp
@@ -26,7 +26,7 @@ Vector<Real> WarpX::B_external(3, 0.0);
 
 Real WarpX::gamma_boost = 1.;
 Real WarpX::beta_boost = 0.;
-Vector<Real> WarpX::boost_direction(3, 0.0);
+Vector<Real> WarpX::boost_direction = {0,0,1};
 
 long WarpX::current_deposition_algo = 3;
 long WarpX::charge_deposition_algo = 0;
@@ -180,9 +180,9 @@ WarpX::ReadParameters ()
         // Boosted-frame parameters
         pp.query("gamma_boost", gamma_boost);
         beta_boost = std::sqrt(1.-1./pow(gamma_boost,2));
-        pp.queryarr("boost_direction", boost_direction);
         if( gamma_boost > 1. ){
             // Read and normalize the boost direction
+            pp.queryarr("boost_direction", boost_direction);
             Real s = 1.0/std::sqrt(boost_direction[0]*boost_direction[0] +
                                    boost_direction[1]*boost_direction[1] +
                                    boost_direction[2]*boost_direction[2]);