diff --git a/src/pocketmine/block/utils/DyeColor.php b/src/pocketmine/block/utils/DyeColor.php
index 122403e95..3540d62a3 100644
--- a/src/pocketmine/block/utils/DyeColor.php
+++ b/src/pocketmine/block/utils/DyeColor.php
@@ -57,7 +57,7 @@ final class DyeColor{
 	/** @var DyeColor[] */
 	private static $numericIdMap = [];
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new DyeColor("white", "White", 0, new Color(0xf0, 0xf0, 0xf0)),
 			new DyeColor("orange", "Orange", 1, new Color(0xf9, 0x80, 0x1d)),
diff --git a/src/pocketmine/block/utils/SkullType.php b/src/pocketmine/block/utils/SkullType.php
index 305573788..b53e974b7 100644
--- a/src/pocketmine/block/utils/SkullType.php
+++ b/src/pocketmine/block/utils/SkullType.php
@@ -46,7 +46,7 @@ final class SkullType{
 	/** @var SkullType[] */
 	private static $numericIdMap = [];
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new SkullType("skeleton", "Skeleton Skull", 0),
 			new SkullType("wither_skeleton", "Wither Skeleton Skull", 1),
diff --git a/src/pocketmine/block/utils/SlabType.php b/src/pocketmine/block/utils/SlabType.php
index 53550520f..15035637e 100644
--- a/src/pocketmine/block/utils/SlabType.php
+++ b/src/pocketmine/block/utils/SlabType.php
@@ -37,7 +37,7 @@ use pocketmine\utils\EnumTrait;
 final class SlabType{
 	use EnumTrait;
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new self("bottom"),
 			new self("top"),
diff --git a/src/pocketmine/block/utils/TreeType.php b/src/pocketmine/block/utils/TreeType.php
index 36183d396..8e0622dd6 100644
--- a/src/pocketmine/block/utils/TreeType.php
+++ b/src/pocketmine/block/utils/TreeType.php
@@ -46,7 +46,7 @@ final class TreeType{
 	/** @var TreeType[] */
 	private static $numericIdMap = [];
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new TreeType("oak", "Oak", 0),
 			new TreeType("spruce", "Spruce", 1),
diff --git a/src/pocketmine/item/ItemUseResult.php b/src/pocketmine/item/ItemUseResult.php
index 3341d9161..7f8bdba01 100644
--- a/src/pocketmine/item/ItemUseResult.php
+++ b/src/pocketmine/item/ItemUseResult.php
@@ -37,7 +37,7 @@ use pocketmine\utils\EnumTrait;
 final class ItemUseResult{
 	use EnumTrait;
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new self("none"),
 			new self("fail"),
diff --git a/src/pocketmine/player/GameMode.php b/src/pocketmine/player/GameMode.php
index 33a37fc80..b294dd5ae 100644
--- a/src/pocketmine/player/GameMode.php
+++ b/src/pocketmine/player/GameMode.php
@@ -47,7 +47,7 @@ final class GameMode{
 	/** @var self[] */
 	protected static $magicNumberMap = [];
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new self("survival", 0, "Survival", "gameMode.survival", ["s", "0"]),
 			new self("creative", 1, "Creative", "gameMode.creative", ["c", "1"]),
diff --git a/src/pocketmine/plugin/PluginLoadOrder.php b/src/pocketmine/plugin/PluginLoadOrder.php
index ebca6528b..8e27befcf 100644
--- a/src/pocketmine/plugin/PluginLoadOrder.php
+++ b/src/pocketmine/plugin/PluginLoadOrder.php
@@ -36,7 +36,7 @@ use pocketmine\utils\EnumTrait;
 final class PluginLoadOrder{
 	use EnumTrait;
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new self("startup"),
 			new self("postworld")
diff --git a/src/pocketmine/utils/EnumTrait.php b/src/pocketmine/utils/EnumTrait.php
index 994b05f9d..a93358023 100644
--- a/src/pocketmine/utils/EnumTrait.php
+++ b/src/pocketmine/utils/EnumTrait.php
@@ -54,9 +54,9 @@ trait EnumTrait{
 	 *
 	 * (This ought to be private, but traits suck too much for that.)
 	 *
-	 * @return self[]
+	 * @return self[]|iterable
 	 */
-	abstract protected static function setup() : array;
+	abstract protected static function setup() : iterable;
 
 	/**
 	 * @internal Lazy-inits the enum if necessary.
diff --git a/src/pocketmine/world/sound/NoteInstrument.php b/src/pocketmine/world/sound/NoteInstrument.php
index a36c46f14..622333367 100644
--- a/src/pocketmine/world/sound/NoteInstrument.php
+++ b/src/pocketmine/world/sound/NoteInstrument.php
@@ -41,7 +41,7 @@ class NoteInstrument{
 		__construct as Enum___construct;
 	}
 
-	protected static function setup() : array{
+	protected static function setup() : iterable{
 		return [
 			new self("piano", 0),
 			new self("bass_drum", 1),