diff --git a/src/internal/usergroup/usergroup_others.go b/src/internal/daemon/daemon_others.go
similarity index 66%
rename from src/internal/usergroup/usergroup_others.go
rename to src/internal/daemon/daemon_others.go
index 57e7333..a2468a9 100644
--- a/src/internal/usergroup/usergroup_others.go
+++ b/src/internal/daemon/daemon_others.go
@@ -1,6 +1,6 @@
 //go:build !linux
 
-package usergroup
+package daemon
 
 import (
 	"github.com/sunbk201/ua3f/internal/config"
@@ -9,3 +9,7 @@ import (
 func SetUserGroup(cfg *config.Config) error {
 	return nil
 }
+
+func SetOOMScoreAdj(value int) error {
+	return nil
+}
diff --git a/src/internal/usergroup/usergroup_unix.go b/src/internal/daemon/daemon_unix.go
similarity index 84%
rename from src/internal/usergroup/usergroup_unix.go
rename to src/internal/daemon/daemon_unix.go
index c908daa..9097b45 100644
--- a/src/internal/usergroup/usergroup_unix.go
+++ b/src/internal/daemon/daemon_unix.go
@@ -1,6 +1,6 @@
 //go:build linux
 
-package usergroup
+package daemon
 
 import (
 	"bufio"
@@ -15,6 +15,21 @@ import (
 	"github.com/sunbk201/ua3f/internal/config"
 )
 
+func SetOOMScoreAdj(value int) error {
+	if value < -1000 || value > 1000 {
+		return fmt.Errorf("OOM score adj value %d out of range (-1000 to 1000)", value)
+	}
+	f, err := os.OpenFile("/proc/self/oom_score_adj", os.O_WRONLY, 0)
+	if err != nil {
+		return fmt.Errorf("failed to open /proc/self/oom_score_adj: %w", err)
+	}
+	defer f.Close()
+	if _, err := f.WriteString(strconv.Itoa(value)); err != nil {
+		return fmt.Errorf("failed to write to /proc/self/oom_score_adj: %w", err)
+	}
+	return nil
+}
+
 func SetUserGroup(cfg *config.Config) error {
 	groupName := determineGroup(cfg.ServerMode)
 	if groupName == "" {
diff --git a/src/main.go b/src/main.go
index 950765d..f676f37 100644
--- a/src/main.go
+++ b/src/main.go
@@ -8,11 +8,11 @@ import (
 	"syscall"
 
 	"github.com/sunbk201/ua3f/internal/config"
+	"github.com/sunbk201/ua3f/internal/daemon"
 	"github.com/sunbk201/ua3f/internal/log"
 	"github.com/sunbk201/ua3f/internal/server"
 	"github.com/sunbk201/ua3f/internal/server/desync"
 	"github.com/sunbk201/ua3f/internal/server/netlink"
-	"github.com/sunbk201/ua3f/internal/usergroup"
 )
 
 var (
@@ -32,10 +32,13 @@ func main() {
 
 	log.LogHeader(appVersion, cfg)
 
-	if err := usergroup.SetUserGroup(cfg); err != nil {
-		slog.Error("usergroup.SetUserGroup", slog.Any("error", err))
+	if err := daemon.SetUserGroup(cfg); err != nil {
+		slog.Error("daemon.SetUserGroup", slog.Any("error", err))
 		return
 	}
+	if err := daemon.SetOOMScoreAdj(-800); err != nil {
+		slog.Warn("daemon.SetOOMScoreAdj", slog.Any("error", err))
+	}
 
 	helper := netlink.New(cfg)
 	addShutdown("helper.Close", helper.Close)