diff --git a/examples/cascade_examples/em_shower.cpp b/examples/cascade_examples/em_shower.cpp
index 138717edc83b3b451691a40dd47b25b00899dd78..dace6696db58afb4a7157aa1aa6b9c822f2e9cab 100644
--- a/examples/cascade_examples/em_shower.cpp
+++ b/examples/cascade_examples/em_shower.cpp
@@ -181,6 +181,8 @@ int main(int argc, char** argv) {
   auto sequence = make_sequence(emCascade, emContinuous, longprof, observationLevel, cut);
   // define air shower object, run simulation
   TrackingType tracking;
+  
+  output.startOfLibrary();
 
   output.startOfLibrary();