diff --git a/scripts/FilterEvents/eventFilterGUI.py b/scripts/FilterEvents/eventFilterGUI.py
index 386e5c35d71ae25ddbeda500ccbab6952a335cf4..386fce5c2b7843c02dfaaed9c7707590800ba686 100644
--- a/scripts/FilterEvents/eventFilterGUI.py
+++ b/scripts/FilterEvents/eventFilterGUI.py
@@ -713,7 +713,7 @@ class MainWindow(QtGui.QMainWindow):
         vectimes = numpy.append(vectimes,tf)
         vecvalue = numpy.append(vecvalue, vecvalue[-1])
 
-        vecreltimes = (t - t0) / numpy.timedelta64(1, 's')
+        vecreltimes = (vectimes - t0) / numpy.timedelta64(1, 's')
 
         # Set to plot
         xlim = [vecreltimes.min(), vecreltimes.max()]