diff --git a/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingEfficiencyJsonTool.h b/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingEfficiencyJsonTool.h
index 5adbc9ad7f34721ffd5acf95b968d6c5089820da..31f54c650fa1d8ca9570f416371fbf934fe51c6d 100644
--- a/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingEfficiencyJsonTool.h
+++ b/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingEfficiencyJsonTool.h
@@ -9,7 +9,7 @@
 #include "AsgTools/AsgTool.h"
 #include "PATInterfaces/SystematicsCache.h"
 #include <nlohmann/json.hpp>
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 class BTaggingEfficiencyJsonTool: public asg::AsgTool,
                                   virtual public IBTaggingEfficiencyJsonTool 
diff --git a/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingSelectionJsonTool.h b/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingSelectionJsonTool.h
index f2d96ba1c92adfe9875eec1de6e6927659f964fb..1d4be22279b9ed3ae4bd0af1f790aae9e372feec 100644
--- a/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingSelectionJsonTool.h
+++ b/PhysicsAnalysis/JetTagging/JetTagPerformanceCalibration/xAODBTaggingEfficiency/xAODBTaggingEfficiency/BTaggingSelectionJsonTool.h
@@ -8,7 +8,7 @@
 #include "FTagAnalysisInterfaces/IBTaggingSelectionJsonTool.h"
 #include "AsgTools/AsgTool.h"
 #include <nlohmann/json.hpp>
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 class BTaggingSelectionJsonTool: public asg::AsgTool,
 			     public virtual IBTaggingSelectionJsonTool {