diff --git a/native/src/main/java/io/ballerina/stdlib/grpc/ServerConnectorListener.java b/native/src/main/java/io/ballerina/stdlib/grpc/ServerConnectorListener.java
index 6092c992f..33cbcbe59 100644
--- a/native/src/main/java/io/ballerina/stdlib/grpc/ServerConnectorListener.java
+++ b/native/src/main/java/io/ballerina/stdlib/grpc/ServerConnectorListener.java
@@ -51,6 +51,7 @@ public class ServerConnectorListener implements HttpConnectorListener {
 
     private static final Logger log = LoggerFactory.getLogger(ServerConnectorListener.class);
     private static final String SERVER_CONNECTOR_GRPC = "grpc";
+    private static final String GRPC_PROTOCOL = "grpc";
 
     private final ServicesRegistry servicesRegistry;
     private Map<String, Long> messageSizeMap;
@@ -151,7 +152,7 @@ private ObserverContext getObserverContext(String method, InboundMessage inbound
         observerContext.addProperty(PROPERTY_TRACE_PROPERTIES, httpHeaders);
         observerContext.addTag(TAG_KEY_HTTP_METHOD,
                 (String) inboundMessage.getProperty(HttpConstants.HTTP_REQUEST_METHOD.getValue()));
-        observerContext.addTag(TAG_KEY_PROTOCOL, (String) inboundMessage.getProperty(HttpConstants.PROTOCOL));
+        observerContext.addTag(TAG_KEY_PROTOCOL, GRPC_PROTOCOL);
         observerContext.addTag(TAG_KEY_HTTP_URL, inboundMessage.getPath());
         return observerContext;
     }