diff --git a/src/main/java/org/apache/commons/math3/random/RandomDataImpl.java b/src/main/java/org/apache/commons/math3/random/RandomDataImpl.java
index fa3099a1a..6a8119081 100644
--- a/src/main/java/org/apache/commons/math3/random/RandomDataImpl.java
+++ b/src/main/java/org/apache/commons/math3/random/RandomDataImpl.java
@@ -120,7 +120,7 @@ public class RandomDataImpl implements RandomData, Serializable {
      *
      * By trying, n = 16 in Java is enough to reach 1.0.
      */
-    private static double[] EXPONENTIAL_SA_QI = null;
+    private static final double[] EXPONENTIAL_SA_QI;
 
     /** underlying random number generator */
     private RandomGenerator rand = null;