diff --git a/DQMOffline/Trigger/python/SiPixel_OfflineMonitoring_cff.py b/DQMOffline/Trigger/python/SiPixel_OfflineMonitoring_cff.py
index 545bab3db3f17..7cab5cdcd830d 100644
--- a/DQMOffline/Trigger/python/SiPixel_OfflineMonitoring_cff.py
+++ b/DQMOffline/Trigger/python/SiPixel_OfflineMonitoring_cff.py
@@ -7,7 +7,7 @@
 
 hltSiPixelClusterShapeCache = siPixelClusterShapeCache.clone(src = 'hltSiPixelClusters')
 hltrefittedForPixelDQM = refittedForPixelDQM.clone(src ='hltMergedTracks',
-                                                   TTRHBuilder = cms.string('WithTrackAngle')) # no templates at HLT
+                                                   TTRHBuilder = 'WithTrackAngle') # no templates at HLT
 sipixelMonitorHLTsequence = cms.Sequence(
     hltSiPixelClusterShapeCache
     + hltSiPixelPhase1ClustersAnalyzer