diff --git a/spring-web-reactive/src/main/java/org/springframework/web/reactive/config/WebReactiveConfiguration.java b/spring-web-reactive/src/main/java/org/springframework/web/reactive/config/WebReactiveConfiguration.java
index 303aac3075..96941fcf48 100644
--- a/spring-web-reactive/src/main/java/org/springframework/web/reactive/config/WebReactiveConfiguration.java
+++ b/spring-web-reactive/src/main/java/org/springframework/web/reactive/config/WebReactiveConfiguration.java
@@ -81,9 +81,6 @@ public class WebReactiveConfiguration implements ApplicationContextAware {
 	private static final boolean jaxb2Present =
 			ClassUtils.isPresent("javax.xml.bind.Binder", WebReactiveConfiguration.class.getClassLoader());
 
-	private static final boolean rxJava1Present =
-			ClassUtils.isPresent("rx.Observable", WebReactiveConfiguration.class.getClassLoader());
-
 
 	private PathMatchConfigurer pathMatchConfigurer;
 
diff --git a/spring-web-reactive/src/test/java/org/springframework/web/reactive/config/WebReactiveConfigurationTests.java b/spring-web-reactive/src/test/java/org/springframework/web/reactive/config/WebReactiveConfigurationTests.java
index ac115ec848..284d881816 100644
--- a/spring-web-reactive/src/test/java/org/springframework/web/reactive/config/WebReactiveConfigurationTests.java
+++ b/spring-web-reactive/src/test/java/org/springframework/web/reactive/config/WebReactiveConfigurationTests.java
@@ -20,14 +20,10 @@ import java.net.URI;
 import java.nio.ByteBuffer;
 import java.util.Collections;
 import java.util.List;
-import java.util.concurrent.CompletableFuture;
 import javax.xml.bind.annotation.XmlRootElement;
 
 import org.junit.Before;
 import org.junit.Test;
-import reactor.core.publisher.Flux;
-import reactor.core.publisher.Mono;
-import rx.Observable;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -172,18 +168,6 @@ public class WebReactiveConfigurationTests {
 		assertHasMessageReader(messageReaders, TestBean.class, APPLICATION_XML);
 	}
 
-	@Test
-	public void mvcConversionService() throws Exception {
-		ApplicationContext context = loadConfig(WebReactiveConfiguration.class);
-
-		String name = "mvcConversionService";
-		ConversionService service = context.getBean(name, ConversionService.class);
-		assertNotNull(service);
-
-		service.canConvert(CompletableFuture.class, Mono.class);
-		service.canConvert(Observable.class, Flux.class);
-	}
-
 	@Test
 	public void responseEntityResultHandler() throws Exception {
 		ApplicationContext context = loadConfig(WebReactiveConfiguration.class);