diff --git a/sys/userns_linux.go b/sys/userns_linux.go
index 4a70afe8a..534253ad8 100644
--- a/sys/userns_linux.go
+++ b/sys/userns_linux.go
@@ -17,22 +17,36 @@
 package sys
 
 import (
-	"github.com/opencontainers/runc/libcontainer/user"
+	"bufio"
+	"fmt"
+	"os"
 )
 
 // RunningInUserNS detects whether we are currently running in a user namespace.
 // Originally copied from github.com/lxc/lxd/shared/util.go
 func RunningInUserNS() bool {
-	uidmap, err := user.CurrentProcessUIDMap()
+	file, err := os.Open("/proc/self/uid_map")
 	if err != nil {
 		// This kernel-provided file only exists if user namespaces are supported
 		return false
 	}
+	defer file.Close()
+
+	buf := bufio.NewReader(file)
+	l, _, err := buf.ReadLine()
+	if err != nil {
+		return false
+	}
+
+	line := string(l)
+	var a, b, c int64
+	fmt.Sscanf(line, "%d %d %d", &a, &b, &c)
+
 	/*
 	 * We assume we are in the initial user namespace if we have a full
 	 * range - 4294967295 uids starting at uid 0.
 	 */
-	if len(uidmap) == 1 && uidmap[0].ID == 0 && uidmap[0].ParentID == 0 && uidmap[0].Count == 4294967295 {
+	if a == 0 && b == 0 && c == 4294967295 {
 		return false
 	}
 	return true