diff --git a/Trigger/TrigSteer/TrigOutputHandling/CMakeLists.txt b/Trigger/TrigSteer/TrigOutputHandling/CMakeLists.txt
index 1dc131abefc80f62e5337f1fd7de9f5df700505d..4c55ecd4e81b57d749f465c7e05a3ffe376fa11e 100644
--- a/Trigger/TrigSteer/TrigOutputHandling/CMakeLists.txt
+++ b/Trigger/TrigSteer/TrigOutputHandling/CMakeLists.txt
@@ -7,12 +7,13 @@ atlas_subdir( TrigOutputHandling )
 
 find_package( tdaq-common COMPONENTS eformat )
 find_package( Boost )
+find_package( ROOT )
 
 # Component(s) in the package:
 atlas_add_library( TrigOutputHandlingLib
                    src/*.cxx
                    PUBLIC_HEADERS TrigOutputHandling
-                   INCLUDE_DIRS ${TDAQ-COMMON_INCLUDE_DIRS}
+                   INCLUDE_DIRS ${TDAQ-COMMON_INCLUDE_DIRS} ${ROOT_INCLUDE_DIRS}
                    LINK_LIBRARIES ${TDAQ-COMMON_LIBRARIES} GaudiKernel AthViews AthenaBaseComps RootUtils TrigSteeringEvent TrigSerializeResultLib TrigConfData xAODTrigCalo xAODTrigRinger xAODTrigEgamma xAODEgamma xAODBTagging xAODTrigger xAODTracking xAODTrigMuon xAODMuon xAODTau xAODTrigBphys xAODTrigMissingET DecisionHandlingLib AthenaMonitoringKernelLib TrigPartialEventBuildingLib TrigSerializeTPLib AthContainersRoot TrigCompositeUtilsLib TrigCostMonitorMTLib
 		   PRIVATE_LINK_LIBRARIES ${ROOT_LIBRARIES} PathResolver )