diff --git a/artiq/applets/plot_xy_hist.py b/artiq/applets/plot_xy_hist.py
index 82c06d778..7d42aeacc 100755
--- a/artiq/applets/plot_xy_hist.py
+++ b/artiq/applets/plot_xy_hist.py
@@ -124,11 +124,11 @@ class XYHistPlot(QtWidgets.QSplitter):
                 return False
         return True
 
-    def data_changed(self, data, mods):
+    def data_changed(self, value, metadata, persist, mods):
         try:
-            xs = data[self.args.xs][1]
-            histogram_bins = data[self.args.histogram_bins][1]
-            histograms_counts = data[self.args.histograms_counts][1]
+            xs = value[self.args.xs]
+            histogram_bins = value[self.args.histogram_bins]
+            histograms_counts = value[self.args.histograms_counts]
         except KeyError:
             return
         if len(xs) != histograms_counts.shape[0]: