diff --git a/PhysicsTools/Utilities/src/SideBandSubtraction.cc b/PhysicsTools/Utilities/src/SideBandSubtraction.cc
index 799e70693b49f..28158bd6f4ea2 100644
--- a/PhysicsTools/Utilities/src/SideBandSubtraction.cc
+++ b/PhysicsTools/Utilities/src/SideBandSubtraction.cc
@@ -412,7 +412,7 @@ int SideBandSubtract::doGlobalFit() {
     cout << "Beginning SideBand Subtraction\n";
 
   if (ModelPDF != nullptr && Data != nullptr && SeparationVariable != nullptr) {
-    fit_result = ModelPDF->fitTo(*Data, "r");
+    fit_result = ModelPDF->fitTo(*Data, RooCmdArg("r", 0));
   } else {
     cerr << "ERROR: doGobalFit, no ModelPDF, SeparationVariable or Data specified\n";
     return -1;