diff --git a/iso_forest.py b/iso_forest.py
index 23e2fd3..497a94a 100644
--- a/iso_forest.py
+++ b/iso_forest.py
@@ -128,7 +128,7 @@ def __init__(self,x,itree):
 
     def find_path(self,T):
         if T.ntype == 'exNode':
-            if T.size == 1: return self.e
+            if T.size <= 1: return self.e
             else:
                 self.e = self.e + c_factor(T.size)
                 return self.e