diff --git a/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/LogCapture.java b/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/LogCapture.java
index d195ec71c720b..8adf45ae1345d 100644
--- a/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/LogCapture.java
+++ b/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/LogCapture.java
@@ -28,7 +28,8 @@
 
 /**
  * Captures the log events of one logger, down to DEBUG, while it is open. Only one capture is open at a time: opening
- * another one resets the level of the loggers.
+ * another one resets the level of the loggers. The level is set for the whole JVM, so a test class that uses it is
+ * {@code @Isolated} and does not run in parallel with other test classes.
  */
 final class LogCapture extends AbstractAppender implements AutoCloseable {
 
diff --git a/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/Plc4XRepeatedFailureRouteTest.java b/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/Plc4XRepeatedFailureRouteTest.java
index 4e897e9762a3f..29af2b5239c1d 100644
--- a/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/Plc4XRepeatedFailureRouteTest.java
+++ b/components/camel-plc4x/src/test/java/org/apache/camel/component/plc4x/Plc4XRepeatedFailureRouteTest.java
@@ -32,6 +32,7 @@
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.parallel.Isolated;
 
 import static org.awaitility.Awaitility.await;
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -46,7 +47,11 @@
  * at WARN and the end of the run at INFO, instead of a WARN with a stack trace on every poll, while
  * {@code bridgeErrorHandler} still gets every failure. Without {@code autoReconnect}, a lost connection shuts the
  * endpoint down once, and the triggered consumer stops polling until the route is restarted.
+ * <p>
+ * Isolated because {@link LogCapture} changes the level of a logger of the JVM and {@link MockDriver} is programmed
+ * statically, so another test class must not run at the same time.
  */
+@Isolated
 public class Plc4XRepeatedFailureRouteTest extends CamelTestSupport {
 
     private static final String PLC = "plc4x:mock:10.10.10.1/1/1?trigger=TRIG&period=50&tag.temperature=TEMP";