diff --git a/Code/Mantid/scripts/Interface/ui/reflectometer/refl_gui.py b/Code/Mantid/scripts/Interface/ui/reflectometer/refl_gui.py
index 4a3b6980248a..174c7b3e1d1f 100644
--- a/Code/Mantid/scripts/Interface/ui/reflectometer/refl_gui.py
+++ b/Code/Mantid/scripts/Interface/ui/reflectometer/refl_gui.py
@@ -246,7 +246,7 @@ def create_workspace_display_name(self, candidate):
         if isinstance(mtd[candidate], WorkspaceGroup):
             todisplay = candidate # No single run number for a group of workspaces.
         else:
-            todisplay = groupGet(mtd[first_contents], "samp", "run_number")
+            todisplay = groupGet(mtd[candidate], "samp", "run_number")
         return todisplay