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diff --git a/src/main/java/org/apache/commons/math3/fitting/leastsquares/LeastSquaresAdapter.java b/src/main/java/org/apache/commons/math3/fitting/leastsquares/LeastSquaresAdapter.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.fitting.leastsquares;
+
+import org.apache.commons.math3.linear.RealVector;
+import org.apache.commons.math3.optim.ConvergenceChecker;
+import org.apache.commons.math3.util.Incrementor;
+
+/**
+ * An adapter that delegates to another implementation of {@link LeastSquaresProblem}.
+ *
+ * @since 3.3
+ */
+public class LeastSquaresAdapter implements LeastSquaresProblem {
+
+    /** the delegate problem */
+    private final LeastSquaresProblem problem;
+
+    /**
+     * Delegate the {@link LeastSquaresProblem} interface to the given implementation.
+     *
+     * @param problem the delegate
+     */
+    public LeastSquaresAdapter(final LeastSquaresProblem problem) {
+        this.problem = problem;
+    }
+
+    /** {@inheritDoc} */
+    public RealVector getStart() {
+        return problem.getStart();
+    }
+
+    /** {@inheritDoc} */
+    public int getObservationSize() {
+        return problem.getObservationSize();
+    }
+
+    /** {@inheritDoc} */
+    public int getParameterSize() {
+        return problem.getParameterSize();
+    }
+
+    /** {@inheritDoc}
+     * @param point*/
+    public Evaluation evaluate(final RealVector point) {
+        return problem.evaluate(point);
+    }
+
+    /** {@inheritDoc} */
+    public Incrementor getEvaluationCounter() {
+        return problem.getEvaluationCounter();
+    }
+
+    /** {@inheritDoc} */
+    public Incrementor getIterationCounter() {
+        return problem.getIterationCounter();
+    }
+
+    /** {@inheritDoc} */
+    public ConvergenceChecker<Evaluation> getConvergenceChecker() {
+        return problem.getConvergenceChecker();
+    }
+}