diff --git a/CMakeLists.txt b/CMakeLists.txt
index dadb7ed..c0df23f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,7 +34,7 @@ find_package(Gaudi REQUIRED)
 find_package(k4FWCore REQUIRED)
 find_package(DD4hep REQUIRED)
 find_package(ROOT REQUIRED COMPONENTS RIO Tree)
-# find_package(k4SimGeant4 REQUIRED)
+find_package(k4SimGeant4 REQUIRED)
 
 include(cmake/Key4hepConfig.cmake)