diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8386d8eb..b83f1477 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,7 @@ X.Y.Z Release notes
 * None.
 
 ### Bug fixes
-* None.
+* Fixed TypeScript defintion for `open_ssl_verify_callback` configuration option (#1652).
 
 ### Internal
 * Updated to Relm Sync 3.3.0.
diff --git a/lib/index.d.ts b/lib/index.d.ts
index 7f80ad01..2f57990a 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -376,8 +376,16 @@ declare namespace Realm.Sync {
         code: number;
     }
 
+    interface SSLVerifyObject {
+        serverAddress: string;
+        serverPort: number;
+        pemCertificate: string;
+        acceptedByOpenSSL: boolean;
+        depth: number;
+    }
+
     type ErrorCallback = (session: Session, error: SyncError) => void;
-    type SSLVerifyCallback = (serverAddress: string, serverPort: number, pemCertificate: string, preverifyOk: number, depth: number) => boolean;
+    type SSLVerifyCallback = (sslVerifyObject: SSLVerifyObject) => boolean;
 
     interface SyncConfiguration {
         user: User;