--- src/webkit/glue/user_agent.cc
+++ src/webkit/glue/user_agent.cc
@@ -134,6 +134,7 @@ void BuildUserAgent(bool mimic_chrome1,
   base::StringAppendF(
       &user_agent,
       "Mozilla/5.0 (%s%s) AppleWebKit/%d.%d"
-      " (KHTML, like Gecko) %s Safari/%d.%d",
+      " (KHTML, like Gecko) %s Safari/%d.%d"
+      " Vine/RPM_VERSION",
       kUserAgentPlatform,
       webkit_glue::BuildOSCpuInfo().c_str(),
       WEBKIT_VERSION_MAJOR,