diff --git a/src/ruptures/utils/bnode.py b/src/ruptures/utils/bnode.py
index dae8e19f..36c21d96 100644
--- a/src/ruptures/utils/bnode.py
+++ b/src/ruptures/utils/bnode.py
@@ -1,5 +1,6 @@
 """Binary node."""
 import functools
+import numpy as np
 
 
 @functools.total_ordering
@@ -25,6 +26,8 @@ def gain(self):
             return 0
         elif abs(self.val) < 1e-8:
             return 0
+        elif np.isinf(self.val) and self.val < 0:
+            return 0
         return self.val - (self.left.val + self.right.val)
 
     def __lt__(self, other):