diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/DefaultErrorWebExceptionHandler.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/DefaultErrorWebExceptionHandler.java
index 8756092ea69..385f8485e7c 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/DefaultErrorWebExceptionHandler.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/DefaultErrorWebExceptionHandler.java
@@ -131,7 +131,7 @@ public class DefaultErrorWebExceptionHandler extends AbstractErrorWebExceptionHa
 	protected Mono<ServerResponse> renderErrorResponse(ServerRequest request) {
 		boolean includeStackTrace = isIncludeStackTrace(request, MediaType.ALL);
 		Map<String, Object> error = getErrorAttributes(request, includeStackTrace);
-		return ServerResponse.status(getHttpStatus(error)).contentType(MediaType.APPLICATION_JSON_UTF8)
+		return ServerResponse.status(getHttpStatus(error)).contentType(MediaType.APPLICATION_JSON)
 				.body(BodyInserters.fromObject(error));
 	}