diff --git a/PhysicsAnalysis/AnalysisCommon/ParticleJetTools/CMakeLists.txt b/PhysicsAnalysis/AnalysisCommon/ParticleJetTools/CMakeLists.txt
index c6037c209eb88a409839fb44ed9c6389efe4b50c..d8f44123c870aa9c8e97457b93661e8c792695f3 100644
--- a/PhysicsAnalysis/AnalysisCommon/ParticleJetTools/CMakeLists.txt
+++ b/PhysicsAnalysis/AnalysisCommon/ParticleJetTools/CMakeLists.txt
@@ -3,6 +3,8 @@
 # Declare the package name:
 atlas_subdir( ParticleJetTools )
 
+find_package( ROOT )
+
 # Component(s) in the package:
 if( XAOD_STANDALONE )
    atlas_add_library( ParticleJetToolsLib