diff --git a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/SourceStreamTask.java b/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/SourceStreamTask.java
index b709299d789d8..4ebbd0374b97a 100644
--- a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/SourceStreamTask.java
+++ b/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/SourceStreamTask.java
@@ -66,7 +66,7 @@ public class SourceStreamTask<
      * Indicates whether this Task was purposefully finished (by finishTask()), in this case we want
      * to ignore exceptions thrown after finishing, to ensure shutdown works smoothly.
      */
-    private volatile boolean isFinished = false;
+    private volatile boolean wasStoppedExternally = false;
 
     public SourceStreamTask(Environment env) throws Exception {
         this(env, new Object());
@@ -170,11 +170,11 @@ protected void processInput(MailboxDefaultAction.Controller controller) throws E
                                             .isPresent()) {
                                 mailboxProcessor.reportThrowable(
                                         new CancelTaskException(sourceThreadThrowable));
-                            } else if (!isFinished && sourceThreadThrowable != null) {
+                            } else if (!wasStoppedExternally && sourceThreadThrowable != null) {
                                 mailboxProcessor.reportThrowable(sourceThreadThrowable);
                             } else if (sourceThreadThrowable != null
                                     || isCanceled()
-                                    || isFinished) {
+                                    || wasStoppedExternally) {
                                 mailboxProcessor.allActionsCompleted();
                             } else {
                                 // this is a "true" end of input regardless of whether
@@ -205,7 +205,7 @@ protected void cancelTask() {
 
     @Override
     protected void finishTask() throws Exception {
-        isFinished = true;
+        wasStoppedExternally = true;
         cancelTask();
     }