diff --git a/plotPostProcess.py b/plotPostProcess.py
index 4bbbb86e5201ca7773a8ce7ed545a68f833b5b23..3a72f1d2d41c05fc0d4cdf7c441633e04d3916c5 100644
--- a/plotPostProcess.py
+++ b/plotPostProcess.py
@@ -447,7 +447,7 @@ def fillMasterHistDict( inputFileDict , masterHistDict = collections.defaultdict
         DSIDHelper = inputFileDict[mcTag]["DSIDHelper"]
 
         # get the histograms in the diffrent TDirectories within the provided .root file
-        dirsAndContents = getTDirsAndContents(postProcessedData, recursiveCounter = float("inf"))
+        dirsAndContents = getTDirsAndContents(postProcessedData, outputDict = {}, recursiveCounter = float("inf"))