diff --git a/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/online/HttpSource.kt b/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/online/HttpSource.kt
index 5ee2052c4a..52e13ec3c7 100644
--- a/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/online/HttpSource.kt
+++ b/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/online/HttpSource.kt
@@ -108,6 +108,7 @@ abstract class HttpSource : CatalogueSource {
      *
      * @param page the page number to retrieve.
      */
+    @Deprecated("Use the non-RxJava API instead", replaceWith = ReplaceWith("getPopularManga"))
     override fun fetchPopularManga(page: Int): Observable<MangasPage> {
         return client.newCall(popularMangaRequest(page))
             .asObservableSuccess()
@@ -138,6 +139,7 @@ abstract class HttpSource : CatalogueSource {
      * @param query the search query.
      * @param filters the list of filters to apply.
      */
+    @Deprecated("Use the non-RxJava API instead", replaceWith = ReplaceWith("getSearchManga"))
     override fun fetchSearchManga(
         page: Int,
         query: String,
@@ -182,6 +184,7 @@ abstract class HttpSource : CatalogueSource {
      *
      * @param page the page number to retrieve.
      */
+    @Deprecated("Use the non-RxJava API instead", replaceWith = ReplaceWith("getLatestUpdates"))
     override fun fetchLatestUpdates(page: Int): Observable<MangasPage> {
         return client.newCall(latestUpdatesRequest(page))
             .asObservableSuccess()