diff --git a/examples/scrollingPlots.py b/examples/scrollingPlots.py
index 623b9ab1..313d4e8d 100644
--- a/examples/scrollingPlots.py
+++ b/examples/scrollingPlots.py
@@ -21,7 +21,7 @@ curve1 = p1.plot(data1)
 curve2 = p2.plot(data1)
 ptr1 = 0
 def update1():
-    global data1, curve1, ptr1
+    global data1, ptr1
     data1[:-1] = data1[1:]  # shift data in the array one sample left
                             # (see also: np.roll)
     data1[-1] = np.random.normal()