diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java
index 27be9346..5f3d52d1 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/NettyRoutingFilter.java
@@ -117,7 +117,7 @@ public class NettyRoutingFilter implements GlobalFilter, Ordered {
 		});
 
 		if (properties.getResponseTimeout() != null) {
-			responseMono.timeout(properties.getResponseTimeout(),
+			responseMono = responseMono.timeout(properties.getResponseTimeout(),
 					Mono.error(new TimeoutException("Response took longer than timeout: " +
 							properties.getResponseTimeout())));
 		}