diff --git a/runviewer/__main__.py b/runviewer/__main__.py
index bbccb2a..8aa1bb2 100644
--- a/runviewer/__main__.py
+++ b/runviewer/__main__.py
@@ -1671,7 +1671,7 @@ def handler(self, h5_filepath):
     splash.hide()
 
     def execute_program():
-        qapplication.exec_()
+        qapplication.exec()
 
     # Let the interpreter run every 500ms so it sees Ctrl-C interrupts:
     timer = QTimer()