diff --git a/persistence/persistence-mybatis/src/main/resources/org/cbioportal/persistence/mybatiscolumnstore/StudyViewMapper.xml b/persistence/persistence-mybatis/src/main/resources/org/cbioportal/persistence/mybatiscolumnstore/StudyViewMapper.xml
index 90ea4124c07..b2c588c89d6 100644
--- a/persistence/persistence-mybatis/src/main/resources/org/cbioportal/persistence/mybatiscolumnstore/StudyViewMapper.xml
+++ b/persistence/persistence-mybatis/src/main/resources/org/cbioportal/persistence/mybatiscolumnstore/StudyViewMapper.xml
@@ -9,8 +9,8 @@
             patient_stable_id as patientStableId,
             sample_stable_id as stableId,
             cancer_study_identifier as cancerStudyIdentifier,
-            base64Encode(sample_unique_id) as uniqueSampleKey,
-            base64Encode(patient_unique_id) as uniquePatientKey
+            sample_unique_id_base64 as uniqueSampleKey,
+            patient_unique_id_base64 as uniquePatientKey
         FROM sample
         WHERE sample_unique_id IN (
             <!-- Study View Filter-->