diff --git a/artiq/applets/image.py b/artiq/applets/image.py
index 86b8653e7..f64e71ff8 100755
--- a/artiq/applets/image.py
+++ b/artiq/applets/image.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3.5
 
-import numpy as np
 import PyQt5  # make sure pyqtgraph imports Qt5
 import pyqtgraph
 
diff --git a/artiq/applets/plot_hist.py b/artiq/applets/plot_hist.py
index 3f46ffa1e..b577120e7 100755
--- a/artiq/applets/plot_hist.py
+++ b/artiq/applets/plot_hist.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3.5
 
-import numpy as np
 import PyQt5  # make sure pyqtgraph imports Qt5
 import pyqtgraph
 
diff --git a/artiq/applets/plot_xy_hist.py b/artiq/applets/plot_xy_hist.py
index 0bf8987f3..bc5cfbe7e 100755
--- a/artiq/applets/plot_xy_hist.py
+++ b/artiq/applets/plot_xy_hist.py
@@ -23,7 +23,7 @@ def _compute_ys(histogram_bins, histograms_counts):
 class XYHistPlot(QtWidgets.QSplitter):
     def __init__(self, args):
         QtWidgets.QSplitter.__init__(self)
-        self.resize(1000,600)
+        self.resize(1000, 600)
         self.setWindowTitle("XY/Histogram")
 
         self.xy_plot = pyqtgraph.PlotWidget()
@@ -121,7 +121,7 @@ class XYHistPlot(QtWidgets.QSplitter):
             self._set_partial_data(xs, histograms_counts)
         else:
             self._set_full_data(xs, histogram_bins, histograms_counts)
-        
+
 
 def main():
     applet = SimpleApplet(XYHistPlot)