diff --git a/mseedpeek/mseedpeek.py b/mseedpeek/mseedpeek.py
index 4c26aced1e20508359a9d9094911f57ac83ba4e7..a67daab4302dce487b1c652493e7f465c849fcca 100755
--- a/mseedpeek/mseedpeek.py
+++ b/mseedpeek/mseedpeek.py
@@ -218,7 +218,7 @@ class MainWindow:
         # if files entered on commandline set self.ListInFiles
         self.ListInFiles = {}
         if InFiles:
-            self.ListInFiles = ListInFiles
+            self.ListInFiles = InFiles
         # some standard vars
         self.DataDirs = StringVar()
         self.StatSel = StringVar()