diff --git a/src/review-request.ts b/src/review-request.ts
index 3fbcbf96a..cd5759c50 100644
--- a/src/review-request.ts
+++ b/src/review-request.ts
@@ -21,6 +21,7 @@ import type {
   PreprintId,
   PreprintsorgPreprintId,
   PsyarxivPreprintId,
+  ResearchSquarePreprintId,
   ScieloPreprintId,
   SocarxivPreprintId,
   TechrxivPreprintId,
@@ -42,6 +43,7 @@ export type ReviewRequestPreprintId =
   | OsfPreprintsPreprintId
   | PreprintsorgPreprintId
   | PsyarxivPreprintId
+  | ResearchSquarePreprintId
   | ScieloPreprintId
   | SocarxivPreprintId
   | TechrxivPreprintId
@@ -137,6 +139,7 @@ export function isReviewRequestPreprintId(preprint: PreprintId): preprint is Rev
           'osf-preprints',
           'preprints.org',
           'psyarxiv',
+          'research-square',
           'scielo',
           'socarxiv',
           'techrxiv',
diff --git a/test/fc.ts b/test/fc.ts
index 2c81bf631..ba5daa07d 100644
--- a/test/fc.ts
+++ b/test/fc.ts
@@ -958,6 +958,7 @@ export const reviewRequestPreprintId = (): fc.Arbitrary<ReviewRequestPreprintId>
     osfPreprintsPreprintId(),
     preprintsorgPreprintId(),
     psyarxivPreprintId(),
+    researchSquarePreprintId(),
     scieloPreprintId(),
     socarxivPreprintId(),
     techrxivPreprintId(),
@@ -976,7 +977,6 @@ export const notAReviewRequestPreprintId = (): fc.Arbitrary<Exclude<PreprintId,
     osfPreprintId(),
     philsciPreprintId(),
     psychArchivesPreprintId(),
-    researchSquarePreprintId(),
     scienceOpenPreprintId(),
     verixivPreprintId(),
     zenodoPreprintId(),