diff --git a/nodes/core.py b/nodes/core.py
index 0705c0a..d9272a1 100644
--- a/nodes/core.py
+++ b/nodes/core.py
@@ -288,7 +288,7 @@ def plot_curve(curve, n):
 
         m=3
         if n < m:
-            n = self.duration + 1
+            n = curve.duration + 1
             n = max(m, n)