diff --git a/NPSimulation/EventGenerator/CMakeLists.txt b/NPSimulation/EventGenerator/CMakeLists.txt
index 675b443c06a292e419dc3b95e08fbfd2fe4d0fd9..3bcc1361a6f2285bca1cbc0c19b6d88e650c4752 100644
--- a/NPSimulation/EventGenerator/CMakeLists.txt
+++ b/NPSimulation/EventGenerator/CMakeLists.txt
@@ -1,2 +1,2 @@
-add_library(NPSEventGenerator OBJECT EventGeneratorBeam.cc EventGeneratorMultipleParticle.cc EventGeneratorIsotropic.cc VEventGenerator.cc) 
+add_library(NPSEventGenerator OBJECT EventGeneratorBeam.cc EventGeneratorMultipleParticle.cc EventGeneratorCosmic.cc EventGeneratorIsotropic.cc VEventGenerator.cc) 
 #target_link_libraries(NPSEventGenerator ${ROOT_LIBRARIES} ${Geant4_LIBRARIES} ${NPLib_LIBRARIES} -lNPInitialConditions -lNPInteractionCoordinates )