diff --git a/Trigger/TrigHypothesis/TrigBjetHypo/CMakeLists.txt b/Trigger/TrigHypothesis/TrigBjetHypo/CMakeLists.txt
index 4d4bc0dd2c0b7ca68fdd0228953e73bc04b2f057..89ed0b26ff68ac3c57a93b45b88a3e178e0825da 100644
--- a/Trigger/TrigHypothesis/TrigBjetHypo/CMakeLists.txt
+++ b/Trigger/TrigHypothesis/TrigBjetHypo/CMakeLists.txt
@@ -5,6 +5,7 @@ atlas_subdir( TrigBjetHypo )
 
 # External dependencies:
 find_package( ROOT COMPONENTS MathCore )
+find_package( CLHEP )
 
 # Component(s) in the package:
 atlas_add_component( TrigBjetHypo