diff --git a/src/main/java/org/apache/commons/math/util/MathUtils.java b/src/main/java/org/apache/commons/math/util/MathUtils.java
index a488c6191..cbb7b5bb6 100644
--- a/src/main/java/org/apache/commons/math/util/MathUtils.java
+++ b/src/main/java/org/apache/commons/math/util/MathUtils.java
@@ -1293,8 +1293,8 @@ public final class MathUtils {
     public static double reduce(double a,
                                 double period,
                                 double offset) {
-        final double p = Math.abs(period);
-        return a - p * Math.floor((a - offset) / p) - offset;
+        final double p = FastMath.abs(period);
+        return a - p * FastMath.floor((a - offset) / p) - offset;
     }
 
      /**