diff --git a/dataservice/api/sequencing_experiment/schemas.py b/dataservice/api/sequencing_experiment/schemas.py
index 5b5edb7c..9c646220 100644
--- a/dataservice/api/sequencing_experiment/schemas.py
+++ b/dataservice/api/sequencing_experiment/schemas.py
@@ -26,7 +26,7 @@
                           'Poly-T Enrichment', 'Random', 'rRNA Depletion',
                           'miRNA Size Fractionation', 'Other'}
 
-LIBRARY_PREP_ENUM = {'polyA', 'polyA Stranded', 'totalRNAseq', 'Other'}
+LIBRARY_PREP_ENUM = {'polyA', 'totalRNAseq', 'Other'}
 
 
 class SequencingExperimentSchema(BaseSchema):