diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/CarrierItem.java b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/CarrierItem.java
index 80385079b..8cb146f1c 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/CarrierItem.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/CarrierItem.java
@@ -39,7 +39,7 @@ public class CarrierItem implements Iterator<CarrierItem> {
         if (StringUtil.isEmpty(NAMESPACE)) {
             this.headKey = headKey;
         } else {
-            this.headKey = NAMESPACE + ":" + headValue;
+            this.headKey = NAMESPACE + "-" + headKey;
         }
         this.headValue = headValue;
         this.next = next;