diff --git a/src/genetic_algorithm.py b/src/genetic_algorithm.py
index cae5eb1..9fab9b3 100644
--- a/src/genetic_algorithm.py
+++ b/src/genetic_algorithm.py
@@ -1,4 +1,4 @@
-from numpy import sum, append, arange, delete, where
+from numpy import sum, append, arange, delete, intersect1d
 from numpy.random import randint, choice, shuffle
 from pandas import DataFrame
 from math import ceil
@@ -87,7 +87,7 @@ def repair_offspring(offspring, parents, m):
 def get_matching_genes(parents):
     first_parent = parents[0].point.values
     second_parent = parents[1].point.values
-    return where(first_parent == second_parent)[0]
+    return intersect1d(first_parent, second_parent)
 
 
 def populate_offspring(values):