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 db372111..595cf41e 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
@@ -69,6 +69,12 @@ 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 a8415471..0d61eb7d 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
@@ -1100,6 +1100,17 @@ 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
 	void bufferSizeCommitsOnce() throws Exception {
 		String expected = "1234567890";