diff --git a/libcontainer/system/proc.go b/libcontainer/system/proc.go
index 0dbff54d6..b73cf70b4 100644
--- a/libcontainer/system/proc.go
+++ b/libcontainer/system/proc.go
@@ -71,16 +71,6 @@ func Stat(pid int) (stat Stat_t, err error) {
 	return parseStat(string(bytes))
 }
 
-// GetProcessStartTime is deprecated.  Use Stat(pid) and
-// Stat_t.StartTime instead.
-func GetProcessStartTime(pid int) (string, error) {
-	stat, err := Stat(pid)
-	if err != nil {
-		return "", err
-	}
-	return strconv.FormatUint(stat.StartTime, 10), nil
-}
-
 func parseStat(data string) (stat Stat_t, err error) {
 	// From proc(5), field 2 could contain space and is inside `(` and `)`.
 	// The following is an example: