diff --git a/src/main/java/org/apache/commons/math3/genetics/NPointCrossover.java b/src/main/java/org/apache/commons/math3/genetics/NPointCrossover.java
index 436eab767..7d975bc40 100644
--- a/src/main/java/org/apache/commons/math3/genetics/NPointCrossover.java
+++ b/src/main/java/org/apache/commons/math3/genetics/NPointCrossover.java
@@ -139,8 +139,8 @@ public class NPointCrossover<T> implements CrossoverPolicy {
         final List<T> parent1Rep = first.getRepresentation();
         final List<T> parent2Rep = second.getRepresentation();
         // and of the children
-        final List<T> child1Rep = new ArrayList<T>(first.getLength());
-        final List<T> child2Rep = new ArrayList<T>(second.getLength());
+        final List<T> child1Rep = new ArrayList<T>(length);
+        final List<T> child2Rep = new ArrayList<T>(length);
 
         final RandomGenerator random = GeneticAlgorithm.getRandomGenerator();
 
diff --git a/src/main/java/org/apache/commons/math3/genetics/OnePointCrossover.java b/src/main/java/org/apache/commons/math3/genetics/OnePointCrossover.java
index 8ac6d1b2a..9dea40d32 100644
--- a/src/main/java/org/apache/commons/math3/genetics/OnePointCrossover.java
+++ b/src/main/java/org/apache/commons/math3/genetics/OnePointCrossover.java
@@ -105,8 +105,8 @@ public class OnePointCrossover<T> implements CrossoverPolicy {
         final List<T> parent1Rep = first.getRepresentation();
         final List<T> parent2Rep = second.getRepresentation();
         // and of the children
-        final List<T> child1Rep = new ArrayList<T>(first.getLength());
-        final List<T> child2Rep = new ArrayList<T>(second.getLength());
+        final List<T> child1Rep = new ArrayList<T>(length);
+        final List<T> child2Rep = new ArrayList<T>(length);
 
         // select a crossover point at random (0 and length makes no sense)
         final int crossoverIndex = 1 + (GeneticAlgorithm.getRandomGenerator().nextInt(length-2));
diff --git a/src/main/java/org/apache/commons/math3/genetics/UniformCrossover.java b/src/main/java/org/apache/commons/math3/genetics/UniformCrossover.java
index b135f91d8..cd215324c 100644
--- a/src/main/java/org/apache/commons/math3/genetics/UniformCrossover.java
+++ b/src/main/java/org/apache/commons/math3/genetics/UniformCrossover.java
@@ -112,8 +112,8 @@ public class UniformCrossover<T> implements CrossoverPolicy {
         final List<T> parent1Rep = first.getRepresentation();
         final List<T> parent2Rep = second.getRepresentation();
         // and of the children
-        final List<T> child1Rep = new ArrayList<T>(first.getLength());
-        final List<T> child2Rep = new ArrayList<T>(second.getLength());
+        final List<T> child1Rep = new ArrayList<T>(length);
+        final List<T> child2Rep = new ArrayList<T>(length);
 
         final RandomGenerator random = GeneticAlgorithm.getRandomGenerator();