diff --git a/src/main/java/org/apache/commons/math/linear/ConjugateGradient.java b/src/main/java/org/apache/commons/math/linear/ConjugateGradient.java
index 6dfb4e63b..b83aa2960 100644
--- a/src/main/java/org/apache/commons/math/linear/ConjugateGradient.java
+++ b/src/main/java/org/apache/commons/math/linear/ConjugateGradient.java
@@ -194,6 +194,8 @@ public class ConjugateGradient
         final IterativeLinearSolverEvent event;
         event = new ConjugateGradientEvent(this) {
 
+            private static final long serialVersionUID = 756911840348776676L;
+
             public RealVector getResidual() {
                 return ArrayRealVector.unmodifiableRealVector(r);
             }
diff --git a/src/main/java/org/apache/commons/math/linear/SymmLQ.java b/src/main/java/org/apache/commons/math/linear/SymmLQ.java
index 1ee08d352..7c4fd926a 100644
--- a/src/main/java/org/apache/commons/math/linear/SymmLQ.java
+++ b/src/main/java/org/apache/commons/math/linear/SymmLQ.java
@@ -1216,6 +1216,8 @@ public class SymmLQ
         final IterativeLinearSolverEvent event;
         event = new IterativeLinearSolverEvent(this) {
 
+           private static final long serialVersionUID = 3656926699603081076L;
+
             @Override
             public RealVector getRightHandSideVector() {
                 return bb;
diff --git a/src/main/java/org/apache/commons/math/optimization/direct/BOBYQAOptimizer.java b/src/main/java/org/apache/commons/math/optimization/direct/BOBYQAOptimizer.java
index 88bb2a7f7..2159bbd84 100644
--- a/src/main/java/org/apache/commons/math/optimization/direct/BOBYQAOptimizer.java
+++ b/src/main/java/org/apache/commons/math/optimization/direct/BOBYQAOptimizer.java
@@ -2470,6 +2470,8 @@ public class BOBYQAOptimizer
  * If the path becomes explored, it should just be removed from the code.
  */
 class PathIsExploredException extends RuntimeException {
+    private static final long serialVersionUID = 745350979634801853L;
+
     private static final String PATH_IS_EXPLORED
         = "If this exception is thrown, just remove it from the code";