diff --git a/libcontainer/specconv/spec_linux.go b/libcontainer/specconv/spec_linux.go
index 141fe84f6..3b744f167 100644
--- a/libcontainer/specconv/spec_linux.go
+++ b/libcontainer/specconv/spec_linux.go
@@ -24,8 +24,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-const wildcard = -1
-
 var namespaceMapping = map[specs.LinuxNamespaceType]configs.NamespaceType{
 	specs.PIDNamespace:     configs.NEWPID,
 	specs.NetworkNamespace: configs.NEWNET,