diff --git a/jcl/src/java.base/share/classes/java/lang/Thread.java b/jcl/src/java.base/share/classes/java/lang/Thread.java
index 42427755c54..29ca60a66e4 100644
--- a/jcl/src/java.base/share/classes/java/lang/Thread.java
+++ b/jcl/src/java.base/share/classes/java/lang/Thread.java
@@ -746,13 +746,10 @@ public static boolean interrupted() {
  * @see			Thread#start
  */
 public final boolean isAlive() {
-	synchronized (lock) {
-		/*[PR CMVC 88976] the Thread is alive until cleanup() is called */
-		return threadRef != NO_REF;
-	}
+	/*[PR CMVC 88976] the Thread is alive until cleanup() is called */
+	return threadRef != NO_REF;
 }
 
-/*[PR 1FJMO7Q] A Thread can be !isAlive() and still be in its ThreadGroup */
 /**
  * Answers <code>true</code> if the receiver has
  * already died and been removed from the ThreadGroup
@@ -764,10 +761,8 @@ public final boolean isAlive() {
  * @see			Thread#isAlive
  */
 private boolean isDead() {
-	// Has already started, is not alive anymore, and has been removed from the ThreadGroup
-	synchronized(lock) {
-		return started && threadRef == NO_REF;
-	}
+	/* Has already started and is not alive anymore. */
+	return (started && (threadRef == NO_REF));
 }
 
 /**