diff --git a/src/gui.py b/src/gui.py
index a4b78bd..a912e93 100644
--- a/src/gui.py
+++ b/src/gui.py
@@ -432,7 +432,7 @@ class AppGui(QWidget):
                     self.offtime_dict[pv].setAlignment(Qt.AlignRight)
                     
                 elif ", " in delta:
-                    le_split = _delta.split(", ")
+                    le_split = delta.split(", ")
                     if len(le_split) == 2:
                         if len(le_split[1]) == len("0:00:00"):
                             delta = le_split[0] + ",   " + le_split[1]