diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/config/ConfigKey.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/config/ConfigKey.kt
index 8603ac62..62b8107b 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/config/ConfigKey.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/config/ConfigKey.kt
@@ -1,14 +1,14 @@
 package org.koitharu.kotatsu.parsers.config
 
 sealed class ConfigKey<T>(
-	val key: String,
+	@JvmField val key: String,
 ) {
 
 	abstract val defaultValue: T
 
 	class Domain(
 		override val defaultValue: String,
-		val presetValues: Array<String>?,
+		@JvmField val presetValues: Array<String>?,
 	) : ConfigKey<String>("domain")
 
 	class ShowSuspiciousContent(
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicon.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicon.kt
index 7256524e..41e092ff 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicon.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicon.kt
@@ -3,11 +3,12 @@ package org.koitharu.kotatsu.parsers.model
 import okhttp3.HttpUrl.Companion.toHttpUrl
 
 class Favicon internal constructor(
-	val url: String,
-	val size: Int,
-	internal val rel: String?,
+	@JvmField val url: String,
+	@JvmField val size: Int,
+	@JvmField internal val rel: String?,
 ) : Comparable<Favicon> {
 
+	@JvmField
 	val type: String = url.toHttpUrl().pathSegments.last()
 		.substringAfterLast('.', "").lowercase()
 
@@ -48,4 +49,4 @@ class Favicon internal constructor(
 		"mask-icon" -> -1
 		else -> 0
 	}
-}
\ No newline at end of file
+}
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicons.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicons.kt
index f9c9aab7..6c37fe4f 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicons.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Favicons.kt
@@ -2,7 +2,7 @@ package org.koitharu.kotatsu.parsers.model
 
 class Favicons internal constructor(
 	favicons: Collection<Favicon>,
-	val referer: String,
+	@JvmField val referer: String,
 ) : Collection<Favicon> {
 
 	private val icons = favicons.sortedDescending()
@@ -42,4 +42,4 @@ class Favicons internal constructor(
 		}
 		return result
 	}
-}
\ No newline at end of file
+}
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Manga.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Manga.kt
index 0f45a992..afda6dc8 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Manga.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/Manga.kt
@@ -6,67 +6,67 @@ class Manga(
 	/**
 	 * Unique identifier for manga
 	 */
-	val id: Long,
+	@JvmField val id: Long,
 	/**
 	 * Manga title, human-readable
 	 */
-	val title: String,
+	@JvmField val title: String,
 	/**
 	 * Alternative title (for example on other language), may be null
 	 */
-	val altTitle: String?,
+	@JvmField val altTitle: String?,
 	/**
 	 * Relative url to manga (**without** a domain) or any other uri.
 	 * Used principally in parsers
 	 */
-	val url: String,
+	@JvmField val url: String,
 	/**
 	 * Absolute url to manga, must be ready to open in browser
 	 */
-	val publicUrl: String,
+	@JvmField val publicUrl: String,
 	/**
 	 * Normalized manga rating, must be in range of 0..1 or [RATING_UNKNOWN] if rating s unknown
 	 * @see hasRating
 	 */
-	val rating: Float,
+	@JvmField val rating: Float,
 	/**
 	 * Indicates that manga may contain sensitive information (18+, NSFW)
 	 */
-	val isNsfw: Boolean,
+	@JvmField val isNsfw: Boolean,
 	/**
 	 * Absolute link to the cover
 	 * @see largeCoverUrl
 	 */
-	val coverUrl: String,
+	@JvmField val coverUrl: String,
 	/**
 	 * Tags (genres) of the manga
 	 */
-	val tags: Set<MangaTag>,
+	@JvmField val tags: Set<MangaTag>,
 	/**
 	 * Manga status (ongoing, finished) or null if unknown
 	 */
-	val state: MangaState?,
+	@JvmField val state: MangaState?,
 	/**
 	 * Author of the manga, may be null
 	 */
-	val author: String?,
+	@JvmField val author: String?,
 	/**
 	 * Large cover url (absolute), null if is no large cover
 	 * @see coverUrl
 	 */
-	val largeCoverUrl: String? = null,
+	@JvmField val largeCoverUrl: String? = null,
 	/**
 	 * Manga description, may be html or null
 	 */
-	val description: String? = null,
+	@JvmField val description: String? = null,
 	/**
 	 * List of chapters
 	 */
-	val chapters: List<MangaChapter>? = null,
+	@JvmField val chapters: List<MangaChapter>? = null,
 	/**
 	 * Manga source
 	 */
-	val source: MangaSource,
+	@JvmField val source: MangaSource,
 ) {
 
 	/**
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaChapter.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaChapter.kt
index 4059be66..21e6c6e6 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaChapter.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaChapter.kt
@@ -4,34 +4,34 @@ class MangaChapter(
 	/**
 	 * An unique id of chapter
 	 */
-	val id: Long,
+	@JvmField val id: Long,
 	/**
 	 * User-readable name of chapter
 	 */
-	val name: String,
+	@JvmField val name: String,
 	/**
 	 * Chapter number starting from 1
 	 */
-	val number: Int,
+	@JvmField val number: Int,
 	/**
 	 * Relative url to chapter (**without** a domain) or any other uri.
 	 * Used principally in parsers
 	 */
-	val url: String,
+	@JvmField val url: String,
 	/**
 	 * User-readable name of scanlator (releaser) or null if unknown
 	 */
-	val scanlator: String?,
+	@JvmField val scanlator: String?,
 	/**
 	 * Chapter upload date in milliseconds
 	 */
-	val uploadDate: Long,
+	@JvmField val uploadDate: Long,
 	/**
 	 * User-readable name of branch.
 	 * A branch is a group of chapters that overlap (e.g. different languages)
 	 */
-	val branch: String?,
-	val source: MangaSource,
+	@JvmField val branch: String?,
+	@JvmField val source: MangaSource,
 ) : Comparable<MangaChapter> {
 
 	override fun compareTo(other: MangaChapter): Int {
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaPage.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaPage.kt
index b741fac3..2c463761 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaPage.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaPage.kt
@@ -6,19 +6,19 @@ class MangaPage(
 	/**
 	 * Unique identifier for manga
 	 */
-	val id: Long,
+	@JvmField val id: Long,
 	/**
 	 * Relative url to page (**without** a domain) or any other uri.
 	 * Used principally in parsers.
 	 * May contain link to image or html page.
 	 * @see MangaParser.getPageUrl
 	 */
-	val url: String,
+	@JvmField val url: String,
 	/**
 	 * Absolute url of the small page image if exists, null otherwise
 	 */
-	val preview: String?,
-	val source: MangaSource,
+	@JvmField val preview: String?,
+	@JvmField val source: MangaSource,
 ) {
 
 	override fun equals(other: Any?): Boolean {
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaTag.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaTag.kt
index be0f9083..184a850e 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaTag.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/model/MangaTag.kt
@@ -6,13 +6,13 @@ class MangaTag(
 	/**
 	 * User-readable tag title, should be in Title case
 	 */
-	val title: String,
+	@JvmField val title: String,
 	/**
 	 * Identifier of a tag, must be unique among the source.
 	 * @see MangaParser.getList
 	 */
-	val key: String,
-	val source: MangaSource,
+	@JvmField val key: String,
+	@JvmField val source: MangaSource,
 ) {
 
 	override fun equals(other: Any?): Boolean {