diff --git a/src/particle.cpp b/src/particle.cpp
index 1ec95a4ae67..ef4c983ce62 100644
--- a/src/particle.cpp
+++ b/src/particle.cpp
@@ -400,7 +400,7 @@ void Particle::cross_surface()
     write_message(1, "    Crossing surface {}", surf->id_);
   }
 
-  if (surf->surf_source_ && simulation::current_batch == settings::n_batches) {
+  if (surf->surf_source_ && simulation::current_batch  > settings::n_inactive) {
     SourceSite site;
     site.r = r();
     site.u = u();