1 files changed, 1 insertions, 0 deletions
diff --git a/Source/Evolve/WarpXEvolve.cpp b/Source/Evolve/WarpXEvolve.cpp
index 21deb66d1..269270bd9 100644
--- a/Source/Evolve/WarpXEvolve.cpp
+++ b/Source/Evolve/WarpXEvolve.cpp
@@ -324,6 +324,7 @@ WarpX::Evolve (int numsteps)
                 // This is currently a lab frame calculation.
                 ComputeMagnetostaticField();
             }
+            AddExternalFields();
             ExecutePythonCallback("afterEsolve");
         }