diff --git a/updater/sis-updater-worker/src/updater/mapper.js b/updater/sis-updater-worker/src/updater/mapper.js
index 44e9988198..b36dad25df 100644
--- a/updater/sis-updater-worker/src/updater/mapper.js
+++ b/updater/sis-updater-worker/src/updater/mapper.js
@@ -275,7 +275,7 @@ const courseMapper = courseIdToAttainments => (groupedCourse, substitutions) =>
     coursetypecode,
     min_attainment_date,
     max_attainment_date,
-    is_study_module: false, // VALIDATE THIS PLS
+    is_study_module: course_unit_type == null, // Only course units have a course_unit_type so if it's null, it must be a study module
     substitutions,
     course_unit_type,
   }