diff --git a/src/main/java/org/apache/commons/math4/random/SynchronizedRandomGenerator.java b/src/main/java/org/apache/commons/math4/random/SynchronizedRandomGenerator.java
index 4024043ec..9713eef7a 100644
--- a/src/main/java/org/apache/commons/math4/random/SynchronizedRandomGenerator.java
+++ b/src/main/java/org/apache/commons/math4/random/SynchronizedRandomGenerator.java
@@ -24,7 +24,9 @@ package org.apache.commons.math4.random;
  * class.
  *
  * @since 3.1
+ * @deprecated As of 4.0. No replacement.
  */
+@Deprecated
 public class SynchronizedRandomGenerator implements RandomGenerator {
     /** Object to which all calls will be delegated. */
     private final RandomGenerator wrapped;