diff --git a/metropolis/pkg/socksproxy/protocol.go b/metropolis/pkg/socksproxy/protocol.go
index cb9ae0a..d920099 100644
--- a/metropolis/pkg/socksproxy/protocol.go
+++ b/metropolis/pkg/socksproxy/protocol.go
@@ -116,7 +116,7 @@
 	case 1:
 		addrBytes = make([]byte, 4)
 	case 4:
-		addrBytes = make([]byte, 4)
+		addrBytes = make([]byte, 16)
 	default:
 		return nil, errUnsupportedAddressType
 	}