diff --git a/lib/config/optionsconfiguration.go b/lib/config/optionsconfiguration.go
index 6d732f306..eecf34dda 100644
--- a/lib/config/optionsconfiguration.go
+++ b/lib/config/optionsconfiguration.go
@@ -9,6 +9,7 @@ package config
 import (
 	"fmt"
 	"runtime"
+	"slices"
 
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/rand"
@@ -268,13 +269,7 @@ func (opts OptionsConfiguration) AutoUpgradeEnabled() bool {
 }
 
 func (opts OptionsConfiguration) FeatureFlag(name string) bool {
-	for _, flag := range opts.FeatureFlags {
-		if flag == name {
-			return true
-		}
-	}
-
-	return false
+	return slices.Contains(opts.FeatureFlags, name)
 }
 
 // LowestConnectionLimit is the lower of ConnectionLimitEnough or
diff --git a/lib/model/devicedownloadstate.go b/lib/model/devicedownloadstate.go
index 9fe3a3552..13059499a 100644
--- a/lib/model/devicedownloadstate.go
+++ b/lib/model/devicedownloadstate.go
@@ -7,6 +7,8 @@
 package model
 
 import (
+	"slices"
+
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/sync"
 )
@@ -40,12 +42,7 @@ func (p *deviceFolderDownloadState) Has(file string, version protocol.Vector, in
 		return false
 	}
 
-	for _, existingIndex := range local.blockIndexes {
-		if existingIndex == index {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(local.blockIndexes, index)
 }
 
 // Update updates internal state of what has been downloaded into the temporary