diff --git a/src/courseware/data/thunks.js b/src/courseware/data/thunks.js
index 2a09862e..3ab19c13 100644
--- a/src/courseware/data/thunks.js
+++ b/src/courseware/data/thunks.js
@@ -98,11 +98,6 @@ function mergeLearningSequencesWithCourseBlocks(learningSequencesModels, courseB
       legacyWebUrl: blocksSequence.legacyWebUrl,
       unitIds: blocksSequence.unitIds,
     };
-
-    // Add back-references to this sequence for all child units.
-    blocksSequence.unitIds.forEach(childUnitId => {
-      mergedModels.units[childUnitId].sequenceId = sequenceId;
-    });
   });
 
   // List of Sections comes from Learning Sequences.