diff --git a/macros/CCEScan/voltageFit_spline.C b/macros/CCEScan/voltageFit_spline.C
index fe6be51..a97242b 100755
--- a/macros/CCEScan/voltageFit_spline.C
+++ b/macros/CCEScan/voltageFit_spline.C
@@ -486,7 +486,7 @@
   mg_volt->SetMinimum(0.0);
   mg_volt->GetYaxis()->SetTitle("Charge Equivalent [ADC value]");
   
-  Int_t err_n = 203;
+  Int_t err_n = 2 * (Int_t)maxY + 3;
   Double_t err_x[err_n], err_y[err_n];
   
   for (int i=0; i<err_n-2; i++) {