diff --git a/artiq/applets/progress_bar.py b/artiq/applets/progress_bar.py
index f7eed5c9e..b25d380d8 100644
--- a/artiq/applets/progress_bar.py
+++ b/artiq/applets/progress_bar.py
@@ -12,12 +12,12 @@ class ProgressWidget(QtWidgets.QProgressBar):
         self.setMaximum(args.max)
         self.dataset_value = args.value
 
-    def data_changed(self, data, mods):
+    def data_changed(self, value, metadata, persist, mods):
         try:
-            value = round(data[self.dataset_value][1])
+            val = round(value[self.dataset_value])
         except (KeyError, ValueError, TypeError):
-            value = 0
-        self.setValue(value)
+            val = 0
+        self.setValue(val)