diff --git a/flink-core/src/main/java/org/apache/flink/api/connector/source/SplitEnumeratorContext.java b/flink-core/src/main/java/org/apache/flink/api/connector/source/SplitEnumeratorContext.java
index 3990f65e26c32..6c3637b27728c 100644
--- a/flink-core/src/main/java/org/apache/flink/api/connector/source/SplitEnumeratorContext.java
+++ b/flink-core/src/main/java/org/apache/flink/api/connector/source/SplitEnumeratorContext.java
@@ -195,5 +195,7 @@ <T> void callAsync(
      * source is considered to have isProcessingBacklog=false by default.
      */
     @PublicEvolving
-    void setIsProcessingBacklog(boolean isProcessingBacklog);
+    default void setIsProcessingBacklog(boolean isProcessingBacklog) {
+        throw new UnsupportedOperationException();
+    }
 }