diff --git a/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/SimplexOptimizer.java b/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/SimplexOptimizer.java
index 60a2a388c..a3a20367c 100644
--- a/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/SimplexOptimizer.java
+++ b/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/SimplexOptimizer.java
@@ -123,7 +123,7 @@ public class SimplexOptimizer extends MultivariateOptimizer {
 
         // Indirect call to "computeObjectiveValue" in order to update the
         // evaluations counter.
-        final MultivariateFunction evalFunc = (p) -> computeObjectiveValue(p);
+        final MultivariateFunction evalFunc = p -> computeObjectiveValue(p);
 
         final boolean isMinim = getGoalType() == GoalType.MINIMIZE;
         final Comparator<PointValuePair> comparator = (o1, o2) -> {