diff --git a/media/base/streamparams.h b/media/base/streamparams.h
index 016c27ad0e..f2bc95865f 100644
--- a/media/base/streamparams.h
+++ b/media/base/streamparams.h
@@ -188,6 +188,9 @@ struct StreamSelector {
       streamid(streamid) {
   }
 
+  explicit StreamSelector(const std::string& streamid)
+      : ssrc(0), streamid(streamid) {}
+
   bool Matches(const StreamParams& stream) const {
     if (ssrc == 0) {
       return stream.groupid == groupid && stream.id == streamid;