diff --git a/spring-session-core/src/main/java/org/springframework/session/web/http/OnCommittedResponseWrapper.java b/spring-session-core/src/main/java/org/springframework/session/web/http/OnCommittedResponseWrapper.java
index f08b012b..6691d277 100644
--- a/spring-session-core/src/main/java/org/springframework/session/web/http/OnCommittedResponseWrapper.java
+++ b/spring-session-core/src/main/java/org/springframework/session/web/http/OnCommittedResponseWrapper.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2018 the original author or authors.
+ * Copyright 2014-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -68,6 +68,12 @@ abstract class OnCommittedResponseWrapper extends HttpServletResponseWrapper {
 		super.addHeader(name, value);
 	}
 
+	@Override
+	public void setContentLengthLong(long len) {
+		setContentLength(len);
+		super.setContentLengthLong(len);
+	}
+
 	@Override
 	public void setContentLength(int len) {
 		setContentLength((long) len);
diff --git a/spring-session-core/src/test/java/org/springframework/session/web/http/OnCommittedResponseWrapperTests.java b/spring-session-core/src/test/java/org/springframework/session/web/http/OnCommittedResponseWrapperTests.java
index 716b3ab2..0cbcec4c 100644
--- a/spring-session-core/src/test/java/org/springframework/session/web/http/OnCommittedResponseWrapperTests.java
+++ b/spring-session-core/src/test/java/org/springframework/session/web/http/OnCommittedResponseWrapperTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2017 the original author or authors.
+ * Copyright 2014-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -1102,6 +1102,17 @@ public class OnCommittedResponseWrapperTests {
 		assertThat(this.committed).isTrue();
 	}
 
+	// gh-7261
+	@Test
+	void contentLengthLongOutputStreamWriteStringCommits() throws IOException {
+		String body = "something";
+		this.response.setContentLengthLong(body.length());
+
+		this.response.getOutputStream().print(body);
+
+		assertThat(this.committed).isTrue();
+	}
+
 	@Test
 	public void bufferSizeCommitsOnce() throws Exception {
 		String expected = "1234567890";