diff --git a/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/flux/request/FluxHandlerMethodArgumentResolver.java b/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/flux/request/FluxHandlerMethodArgumentResolver.java
index 525c17ac7..b0b18a4b6 100644
--- a/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/flux/request/FluxHandlerMethodArgumentResolver.java
+++ b/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/flux/request/FluxHandlerMethodArgumentResolver.java
@@ -91,6 +91,7 @@ public class FluxHandlerMethodArgumentResolver
 		if (isPlainText(webRequest) && CharSequence.class.isAssignableFrom(type)) {
 			body = Arrays.asList(StreamUtils.copyToString(nativeRequest.getInputStream(),
 					Charset.forName("UTF-8")));
+			nativeRequest.setAttribute(WebRequestConstants.INPUT_SINGLE, true);
 		}
 		else {
 			String json = new String(StreamUtils.copyToString(
diff --git a/spring-cloud-function-web/src/test/java/org/springframework/cloud/function/web/RestApplicationTests.java b/spring-cloud-function-web/src/test/java/org/springframework/cloud/function/web/RestApplicationTests.java
index 524a0fa6d..0e772f30f 100644
--- a/spring-cloud-function-web/src/test/java/org/springframework/cloud/function/web/RestApplicationTests.java
+++ b/spring-cloud-function-web/src/test/java/org/springframework/cloud/function/web/RestApplicationTests.java
@@ -338,6 +338,14 @@ public class RestApplicationTests {
 		assertThat(result.getBody()).isEqualTo("[\"(FOO)\",\"(BAR)\"]");
 	}
 
+	@Test
+	public void singleValuedText() throws Exception {
+		ResponseEntity<String> result = rest.exchange(RequestEntity
+				.post(new URI("/bareUppercase")).contentType(MediaType.TEXT_PLAIN)
+				.body("foo"), String.class);
+		assertThat(result.getBody()).isEqualTo("(FOO)");
+	}
+
 	@Test
 	public void transform() throws Exception {
 		ResponseEntity<String> result = rest.exchange(RequestEntity