diff --git a/libp2p/muxers/mplex/coder.nim b/libp2p/muxers/mplex/coder.nim
index 83c079b86..5c9c8c726 100644
--- a/libp2p/muxers/mplex/coder.nim
+++ b/libp2p/muxers/mplex/coder.nim
@@ -18,7 +18,7 @@ import types,
 logScope:
   topic = "MplexCoder"
 
-const DefaultChannelSize* = 1 shr 20
+const DefaultChannelSize* = 1 shl 20
 
 type
   Msg* = tuple