diff --git a/PhysicsAnalysis/TruthParticleID/McParticleUtils/CMakeLists.txt b/PhysicsAnalysis/TruthParticleID/McParticleUtils/CMakeLists.txt
index 5457f0d1c86b6d3525ded34dcb0a5a439e546667..293767e7f0649a0cb0eae0618bcb310e41250bd5 100644
--- a/PhysicsAnalysis/TruthParticleID/McParticleUtils/CMakeLists.txt
+++ b/PhysicsAnalysis/TruthParticleID/McParticleUtils/CMakeLists.txt
@@ -7,6 +7,7 @@ atlas_subdir( McParticleUtils )
 find_package( Boost )
 find_package( HepPDT )
 find_package( Python COMPONENTS Development )
+find_package( CLHEP )
 
 # Component(s) in the package:
 atlas_add_library( McParticleUtils