diff --git a/container/mts/mpegts.go b/container/mts/mpegts.go
index 064c0f9b..233a120c 100644
--- a/container/mts/mpegts.go
+++ b/container/mts/mpegts.go
@@ -277,7 +277,7 @@ func FindPSI(d []byte) (int, map[uint16]uint8, map[string]string, error) {
 		return i, nil, meta, errors.Wrap(err, "could not get streams from PMT")
 	}
 
-	var streamMap map[uint16]uint8
+	streamMap := make(map[uint16]uint8)
 	for _, s := range streams {
 		streamMap[s.ElementaryPid()] = s.StreamType()
 	}