diff --git a/utils.py b/utils.py
index 5d91c88ef..a514a67eb 100644
--- a/utils.py
+++ b/utils.py
@@ -717,7 +717,7 @@ def append(self, item):
def extend(self, items):
"""Insert each item in items at its correct position."""
for item in items:
- self.heap.append(item)
+ self.append(item)
def pop(self):
"""Pop and return the item (with min or max f(x) value
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