diff --git a/packages/structures/src/channels/Channel.ts b/packages/structures/src/channels/Channel.ts
index 54701059c..ab03b138b 100644
--- a/packages/structures/src/channels/Channel.ts
+++ b/packages/structures/src/channels/Channel.ts
@@ -3,7 +3,7 @@ import type { APIChannel, APIPartialChannel, ChannelType, ChannelFlags } from 'd
 import { Structure } from '../Structure.js';
 import { ChannelFlagsBitField } from '../bitfields/ChannelFlagsBitField.js';
 import { kData } from '../utils/symbols.js';
-import { isIdSet } from '../utils/type-guards.js';
+import { isFieldSet, isIdSet } from '../utils/type-guards.js';
 import type { Partialize } from '../utils/types.js';
 import type { ChannelPermissionMixin } from './mixins/ChannelPermissionMixin.js';
 import type { ChannelWebhookMixin } from './mixins/ChannelWebhookMixin.js';
@@ -82,9 +82,9 @@ export class Channel<
 	 * to null, respecting Omit behaviors
 	 */
 	public get flags() {
-		const flags =
-			'flags' in this[kData] && typeof this[kData].flags === 'number' ? (this[kData].flags as ChannelFlags) : null;
-		return flags ? new ChannelFlagsBitField(flags) : null;
+		return isFieldSet(this[kData], 'flags', 'number')
+			? new ChannelFlagsBitField(this[kData].flags as ChannelFlags)
+			: null;
 	}
 
 	/**
diff --git a/packages/structures/src/messages/Attachment.ts b/packages/structures/src/messages/Attachment.ts
index e62d350e7..7bf784615 100644
--- a/packages/structures/src/messages/Attachment.ts
+++ b/packages/structures/src/messages/Attachment.ts
@@ -2,6 +2,7 @@ import type { APIAttachment, AttachmentFlags } from 'discord-api-types/v10';
 import { Structure } from '../Structure.js';
 import { AttachmentFlagsBitField } from '../bitfields/AttachmentFlagsBitField.js';
 import { kData } from '../utils/symbols.js';
+import { isFieldSet } from '../utils/type-guards.js';
 import type { Partialize } from '../utils/types.js';
 
 export class Attachment<Omitted extends keyof APIAttachment | '' = ''> extends Structure<APIAttachment, Omitted> {
@@ -112,7 +113,8 @@ export class Attachment<Omitted extends keyof APIAttachment | '' = ''> extends S
 	 * Attachment flags combined as a bitfield
 	 */
 	public get flags() {
-		const flags = this[kData].flags;
-		return flags ? new AttachmentFlagsBitField(this[kData].flags as AttachmentFlags) : null;
+		return isFieldSet(this[kData], 'flags', 'number')
+			? new AttachmentFlagsBitField(this[kData].flags as AttachmentFlags)
+			: null;
 	}
 }
diff --git a/packages/structures/src/messages/Message.ts b/packages/structures/src/messages/Message.ts
index 7fa33895d..b30a46e77 100644
--- a/packages/structures/src/messages/Message.ts
+++ b/packages/structures/src/messages/Message.ts
@@ -4,7 +4,7 @@ import { Structure } from '../Structure.js';
 import { MessageFlagsBitField } from '../bitfields/MessageFlagsBitField.js';
 import { dateToDiscordISOTimestamp } from '../utils/optimization.js';
 import { kData, kEditedTimestamp } from '../utils/symbols.js';
-import { isIdSet } from '../utils/type-guards.js';
+import { isFieldSet, isIdSet } from '../utils/type-guards.js';
 import type { Partialize } from '../utils/types.js';
 
 // TODO: missing substructures: application
@@ -110,8 +110,9 @@ export class Message<Omitted extends keyof APIMessage | '' = 'edited_timestamp'
 	 * The flags of this message as a bit field
 	 */
 	public get flags() {
-		const flags = this[kData].flags;
-		return flags ? new MessageFlagsBitField(this[kData].flags as MessageFlags) : null;
+		return isFieldSet(this[kData], 'flags', 'number')
+			? new MessageFlagsBitField(this[kData].flags as MessageFlags)
+			: null;
 	}
 
 	/**
diff --git a/packages/structures/src/utils/type-guards.ts b/packages/structures/src/utils/type-guards.ts
index 789258380..8fe7129d2 100644
--- a/packages/structures/src/utils/type-guards.ts
+++ b/packages/structures/src/utils/type-guards.ts
@@ -1,3 +1,32 @@
 export function isIdSet(id: unknown): id is bigint | string {
 	return typeof id === 'string' || typeof id === 'bigint';
 }
+
+interface TypeMap {
+	bigint: bigint;
+	boolean: boolean;
+	function(...args: any[]): unknown;
+	number: number;
+	object: object;
+	string: string;
+	symbol: symbol;
+	undefined: undefined;
+}
+
+export type TypeofType = keyof TypeMap;
+
+function hasProperty<Value extends object, Key extends string>(
+	data: Value,
+	fieldName: Key,
+): data is Record<Key, unknown> & Value {
+	return fieldName in data;
+}
+
+export function isFieldSet<Value extends object, Key extends string, Type extends TypeofType>(
+	data: Value,
+	fieldName: Key,
+	type: Type,
+): data is Record<Key, TypeMap[Type]> & Value {
+	// eslint-disable-next-line valid-typeof
+	return hasProperty(data, fieldName) && typeof data[fieldName] === type;
+}