diff --git a/spring-data-mongodb/pom.xml b/spring-data-mongodb/pom.xml
index ad70d987bb..072ed7a2ac 100644
--- a/spring-data-mongodb/pom.xml
+++ b/spring-data-mongodb/pom.xml
@@ -34,6 +34,12 @@
             <version>${mongodb-reactivestreams.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>io.projectreactor</groupId>
+            <artifactId>reactor-core</artifactId>
+            <version>${projectreactor.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-test</artifactId>
@@ -109,6 +115,7 @@
         <spring.version>5.1.0.RELEASE</spring.version>
         <mongodb-reactivestreams.version>1.9.2</mongodb-reactivestreams.version>
         <projectreactor.version>3.2.0.RELEASE</projectreactor.version>
+
     </properties>
 
 </project>