diff --git a/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java b/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java
index 07203df3710..84ee77f3d70 100644
--- a/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java
+++ b/spring-web/src/main/java/org/springframework/http/client/InterceptingClientHttpRequest.java
@@ -93,6 +93,10 @@ class InterceptingClientHttpRequest extends AbstractBufferingClientHttpRequest {
 				request.getHeaders().forEach((key, value) -> delegate.getHeaders().addAll(key, value));
 				request.getAttributes().forEach((key, value) -> delegate.getAttributes().put(key, value));
 				if (body.length > 0) {
+					long contentLength = delegate.getHeaders().getContentLength();
+					if (contentLength > -1 && contentLength != body.length) {
+						delegate.getHeaders().setContentLength(body.length);
+					}
 					if (delegate instanceof StreamingHttpOutputMessage streamingOutputMessage) {
 						streamingOutputMessage.setBody(new StreamingHttpOutputMessage.Body() {
 							@Override
diff --git a/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java b/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java
index 2735c00e315..f8248d0e085 100644
--- a/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java
+++ b/spring-web/src/test/java/org/springframework/http/client/InterceptingClientHttpRequestFactoryTests.java
@@ -204,6 +204,7 @@ class InterceptingClientHttpRequestFactoryTests {
 		ClientHttpRequest request = requestFactory.createRequest(URI.create("https://example.com"), HttpMethod.GET);
 		request.execute();
 		assertThat(Arrays.equals(changedBody, requestMock.getBodyAsBytes())).isTrue();
+		assertThat(requestMock.getHeaders().getContentLength()).isEqualTo(changedBody.length);
 	}