diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesController.kt b/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesController.kt
index a82b4c0..bdf74a5 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesController.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesController.kt
@@ -50,7 +50,7 @@ class ContentSeriesController(private val service: ContentSeriesService) {
     @GetMapping("/{id}/content")
     fun getSeriesContentList(
         @PathVariable id: Long,
-        @RequestParam("sortType", required = false) sortType: SeriesSortType = SeriesSortType.NEWEST,
+        @RequestParam("sortType", defaultValue = "NEWEST") sortType: SeriesSortType,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
         pageable: Pageable
     ) = run {