diff --git a/libcontainer/cgroups/fs/fs.go b/libcontainer/cgroups/fs/fs.go
index 0f0a7a865..dd62dc1e3 100644
--- a/libcontainer/cgroups/fs/fs.go
+++ b/libcontainer/cgroups/fs/fs.go
@@ -18,7 +18,7 @@ import (
 )
 
 var (
-	subsystems = subsystemSet{
+	subsystems = []subsystem{
 		&CpusetGroup{},
 		&DevicesGroup{},
 		&MemoryGroup{},
@@ -38,17 +38,6 @@ var (
 
 var errSubsystemDoesNotExist = errors.New("cgroup: subsystem does not exist")
 
-type subsystemSet []subsystem
-
-func (s subsystemSet) Get(name string) (subsystem, error) {
-	for _, ss := range s {
-		if ss.Name() == name {
-			return ss, nil
-		}
-	}
-	return nil, errSubsystemDoesNotExist
-}
-
 type subsystem interface {
 	// Name returns the name of the subsystem.
 	Name() string
@@ -244,9 +233,9 @@ func (m *manager) GetStats() (*cgroups.Stats, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 	stats := cgroups.NewStats()
-	for name, path := range m.paths {
-		sys, err := subsystems.Get(name)
-		if err == errSubsystemDoesNotExist {
+	for _, sys := range subsystems {
+		path := m.paths[sys.Name()]
+		if path == "" {
 			continue
 		}
 		if err := sys.GetStats(path, stats); err != nil {
diff --git a/libcontainer/cgroups/systemd/v1.go b/libcontainer/cgroups/systemd/v1.go
index c3cc9c8b3..7217b0af7 100644
--- a/libcontainer/cgroups/systemd/v1.go
+++ b/libcontainer/cgroups/systemd/v1.go
@@ -41,18 +41,7 @@ type subsystem interface {
 
 var errSubsystemDoesNotExist = errors.New("cgroup: subsystem does not exist")
 
-type subsystemSet []subsystem
-
-func (s subsystemSet) Get(name string) (subsystem, error) {
-	for _, ss := range s {
-		if ss.Name() == name {
-			return ss, nil
-		}
-	}
-	return nil, errSubsystemDoesNotExist
-}
-
-var legacySubsystems = subsystemSet{
+var legacySubsystems = []subsystem{
 	&fs.CpusetGroup{},
 	&fs.DevicesGroup{},
 	&fs.MemoryGroup{},
@@ -355,9 +344,9 @@ func (m *legacyManager) GetStats() (*cgroups.Stats, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 	stats := cgroups.NewStats()
-	for name, path := range m.paths {
-		sys, err := legacySubsystems.Get(name)
-		if err == errSubsystemDoesNotExist || !cgroups.PathExists(path) {
+	for _, sys := range legacySubsystems {
+		path := m.paths[sys.Name()]
+		if path == "" {
 			continue
 		}
 		if err := sys.GetStats(path, stats); err != nil {