handshake.go | 2 +-

diff --git a/handshake.go b/handshake.go
index 60a546208fdfa58f2b4a63cb76b574f808dbddb2..0262e81c67f033e29169678de8c54dab4c94a2ec 100644
--- a/handshake.go
+++ b/handshake.go
@@ -51,7 +51,7 @@ 	return pex.GetBit(ExtensionBitFast)
 }
 
 func (pex *peerExtensionBytes) SetBit(bit ExtensionBit) {
-	pex[7-bit/8] |= 1 << bit % 8
+	pex[7-bit/8] |= 1 << (bit % 8)
 }
 
 func (pex peerExtensionBytes) GetBit(bit ExtensionBit) bool {