diff --git a/spring-kafka/src/main/java/org/springframework/kafka/listener/ContainerProperties.java b/spring-kafka/src/main/java/org/springframework/kafka/listener/ContainerProperties.java
index 1924adb4..3318b55e 100644
--- a/spring-kafka/src/main/java/org/springframework/kafka/listener/ContainerProperties.java
+++ b/spring-kafka/src/main/java/org/springframework/kafka/listener/ContainerProperties.java
@@ -543,6 +543,7 @@ public class ContainerProperties extends ConsumerProperties {
 		return this.idlePartitionEventInterval;
 	}
 
+	@Nullable
 	public PlatformTransactionManager getTransactionManager() {
 		return this.transactionManager;
 	}
@@ -555,7 +556,7 @@ public class ContainerProperties extends ConsumerProperties {
 	 * @since 1.3
 	 * @see #setAckMode(AckMode)
 	 */
-	public void setTransactionManager(PlatformTransactionManager transactionManager) {
+	public void setTransactionManager(@Nullable PlatformTransactionManager transactionManager) {
 		this.transactionManager = transactionManager;
 	}