diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/ReactorAutoConfiguration.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/ReactorAutoConfiguration.java
index 2051ad8e928e..a220df9ca9be 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/ReactorAutoConfiguration.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/reactor/ReactorAutoConfiguration.java
@@ -34,7 +34,7 @@
  * @author Dave Syer
  */
 @Configuration
-@ConditionalOnClass(EnableReactor.class)
+@ConditionalOnClass({ EnableReactor.class, Environment.class })
 @AutoConfigureAfter(WebMvcAutoConfiguration.class)
 public class ReactorAutoConfiguration {