diff --git a/NPLib/Maya/TMayaHisto.cxx b/NPLib/Maya/TMayaHisto.cxx
index d97199c456a0a5956e51615217891c65ea78e9a5..fb06cb2f34887a0a36166620751add7f0a3d735b 100644
--- a/NPLib/Maya/TMayaHisto.cxx
+++ b/NPLib/Maya/TMayaHisto.cxx
@@ -19,7 +19,7 @@
  *                                                                           *
  *****************************************************************************/
 #include "TMayaHisto.h"
-
+#include "TFormula.h"
 //______________________________________________________________________________
 //                     TMayaHisto methods
 //  TMayaHisto a 2-D histogram with four bytes per cell (float)
@@ -1559,17 +1559,12 @@ Double_t TMayaHisto::FindRange(Int_t ID, Option_t *o, Double_t xo, Double_t yo)
 			if (opt.Contains("Fit")) {
 				if (strcmp(fRangeFunction->GetName(), "_dfltRangeFunction_")
 						== 0) {
-					fRangeFunction->SetParameter(fRangeFunction->GetParNumber(
-							"base"), emax);
-					fRangeFunction->SetParLimits(fRangeFunction->GetParNumber(
-							"base"), emax / 2., emax);
-					fRangeFunction->SetParameter(fRangeFunction->GetParNumber(
-							"slope"), lmax != 0 ? -emax / lmax : 0);
+					fRangeFunction->SetParameter(((TFormula*)fRangeFunction)->GetParNumber("base"), emax);
+					fRangeFunction->SetParLimits(((TFormula*)fRangeFunction)->GetParNumber("base"), emax / 2., emax);
+					fRangeFunction->SetParameter(((TFormula*)fRangeFunction)->GetParNumber("slope"), lmax != 0 ? -emax / lmax : 0);
 				}
-				fRangeFunction->SetParLimits(fRangeFunction->GetParNumber(
-						"range"), 0, lmax);
-				fRangeFunction->SetParameter(fRangeFunction->GetParNumber(
-						"range"), lmax / 2.);
+				fRangeFunction->SetParLimits(((TFormula*)fRangeFunction)->GetParNumber("range"), 0, lmax);
+				fRangeFunction->SetParameter(((TFormula*)fRangeFunction)->GetParNumber("range"), lmax / 2.);
 				h->Fit(fRangeFunction, "b");
 				range = fRangeFunction->GetParameter("range");
 			}
diff --git a/NPLib/Maya/TMayaHisto.h b/NPLib/Maya/TMayaHisto.h
index 568209abb773ad98208f3cbea6d4f98d3616b129..6c814274e23f084324f3f4f377d135470889fbcc 100644
--- a/NPLib/Maya/TMayaHisto.h
+++ b/NPLib/Maya/TMayaHisto.h
@@ -27,6 +27,8 @@
 #include "TFile.h"
 #include "TCutG.h"
 #include "TH2F.h"
+#include "TF1.h"
+#include "TFormula.h"
 #include "TArrayF.h"
 #include "TClonesArray.h"
 #include "TMath.h"
@@ -34,7 +36,6 @@
 #include "TString.h"
 #include "TStyle.h"
 #include "TPad.h"
-#include "TF1.h"
 //#include "TGraph.h"
 #include "TGraphErrors.h"
 #include "TDirectory.h"