diff --git a/libp2p/muxers/mplex/mplex.nim b/libp2p/muxers/mplex/mplex.nim
index 6b4745827..384e6daa0 100644
--- a/libp2p/muxers/mplex/mplex.nim
+++ b/libp2p/muxers/mplex/mplex.nim
@@ -24,6 +24,7 @@ import ../muxer,
 logScope:
   topic = "Mplex"
 
+const MplexCodec* = "/mplex/6.7.0"
 const DefaultRWTimeout = InfiniteDuration
 
 type
diff --git a/libp2p/muxers/mplex/types.nim b/libp2p/muxers/mplex/types.nim
index 559e20249..d66db1b43 100644
--- a/libp2p/muxers/mplex/types.nim
+++ b/libp2p/muxers/mplex/types.nim
@@ -11,7 +11,6 @@ import chronos
 
 const MaxMsgSize* = 1 shl 20 # 1mb
 const MaxChannels* = 1000
-const MplexCodec* = "/mplex/6.7.0"
 const MaxReadWriteTime* = 5.seconds
 
 type