diff --git a/src/java/org/apache/commons/math/analysis/solvers/UnivariateRealSolverImpl.java b/src/java/org/apache/commons/math/analysis/solvers/UnivariateRealSolverImpl.java
index 8156f4e7a..9eb12a322 100644
--- a/src/java/org/apache/commons/math/analysis/solvers/UnivariateRealSolverImpl.java
+++ b/src/java/org/apache/commons/math/analysis/solvers/UnivariateRealSolverImpl.java
@@ -31,6 +31,9 @@ import org.apache.commons.math.analysis.UnivariateRealFunction;
 public abstract class UnivariateRealSolverImpl
     extends ConvergingAlgorithmImpl implements UnivariateRealSolver {
 
+    /** Serializable version ID. */
+    private static final long serialVersionUID = 1L;
+
     /** Maximum error of function. */
     protected double functionValueAccuracy;