diff --git a/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin/ZipkinSpanListener.java b/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin/ZipkinSpanListener.java
index 2945a9d39..1ab4e83c1 100644
--- a/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin/ZipkinSpanListener.java
+++ b/spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin/ZipkinSpanListener.java
@@ -18,7 +18,6 @@ package org.springframework.cloud.sleuth.zipkin;
 
 import java.nio.charset.Charset;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;