diff --git a/src/physics.cpp b/src/physics.cpp
index 3a52396e1..36161f3ea 100644
--- a/src/physics.cpp
+++ b/src/physics.cpp
@@ -194,6 +194,7 @@ void create_fission_sites(Particle& p, int i_nuclide, const Reaction& rx)
     SourceSite site;
     site.r = p.r();
     site.particle = ParticleType::neutron;
+    site.time = p.time();
     site.wgt = 1. / weight;
     site.parent_id = p.id();
     site.progeny_id = p.n_progeny()++;