diff --git a/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/CalibrationDataInterface/Root/CalibrationDataContainer.cxx b/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/CalibrationDataInterface/Root/CalibrationDataContainer.cxx
index a4282a8e0e9b9c1ce05cc070d82be6fb21427df1..b5b064be8c4ab47530aa3841c8b68078f0738a00 100644
--- a/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/CalibrationDataInterface/Root/CalibrationDataContainer.cxx
+++ b/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/CalibrationDataInterface/Root/CalibrationDataContainer.cxx
@@ -880,6 +880,7 @@ CalibrationDataHistogramContainer::getInterpolatedUncertainty(TH1* hist) const
 
     // Copied from TH3::Interpolate()
 
+    yAxis = hist->GetYaxis();
     zAxis = hist->GetZaxis();
 
     Int_t ubx = xAxis->FindBin(m_vars[0]);