diff --git a/spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/DefaultWebGraphQlTester.java b/spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/DefaultWebGraphQlTester.java
index 3df80149..51d0c12e 100644
--- a/spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/DefaultWebGraphQlTester.java
+++ b/spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/DefaultWebGraphQlTester.java
@@ -158,7 +158,7 @@ class DefaultWebGraphQlTester extends DefaultGraphQlTester implements WebGraphQl
 			EntityExchangeResult<byte[]> result = this.client.post()
 					.contentType(MediaType.APPLICATION_JSON)
 					.headers(headers -> headers.putAll(getHeaders(requestInput)))
-					.bodyValue(requestInput)
+					.bodyValue(requestInput.toMap())
 					.exchange()
 					.expectStatus()
 					.isOk()
@@ -181,7 +181,7 @@ class DefaultWebGraphQlTester extends DefaultGraphQlTester implements WebGraphQl
 					.contentType(MediaType.APPLICATION_JSON)
 					.accept(MediaType.TEXT_EVENT_STREAM)
 					.headers(headers -> headers.putAll(getHeaders(requestInput)))
-					.bodyValue(requestInput)
+					.bodyValue(requestInput.toMap())
 					.exchange()
 					.expectStatus()
 					.isOk()