diff --git a/Sources/Classes/Headers/Public/RSClient.h b/Sources/Classes/Headers/Public/RSClient.h
index bc8b9c14..a8ba8e5c 100644
--- a/Sources/Classes/Headers/Public/RSClient.h
+++ b/Sources/Classes/Headers/Public/RSClient.h
@@ -51,7 +51,7 @@ typedef void (^Callback)(NSObject *_Nullable);
 - (void) group:(NSString *)groupId traits:(NSDictionary<NSString*, id>*)traits;
 - (void) group:(NSString *)groupId;
 
-- (void) alias:(NSString *)newId options previousId:(NSString * _Nullable)previousId options:(RSOption * _Nullable);
+- (void) alias:(NSString *)newId previousId:(NSString * _Nullable)previousId options:(RSOption * _Nullable) options;
 - (void) alias:(NSString *)newId options:(RSOption * _Nullable) options;
 - (void) alias:(NSString *)newId;