diff --git a/processing/src/main/java/edu/harvard/hms/dbmi/avillach/hpds/processing/GenomicProcessorParentImpl.java b/processing/src/main/java/edu/harvard/hms/dbmi/avillach/hpds/processing/GenomicProcessorParentImpl.java
index e6f509a8..8b1cb030 100644
--- a/processing/src/main/java/edu/harvard/hms/dbmi/avillach/hpds/processing/GenomicProcessorParentImpl.java
+++ b/processing/src/main/java/edu/harvard/hms/dbmi/avillach/hpds/processing/GenomicProcessorParentImpl.java
@@ -58,7 +58,7 @@ public Set<Integer> patientMaskToPatientIdSet(BigInteger patientMask) {
         String bitmaskString = patientMask.toString(2);
         for(int x = 2;x < bitmaskString.length()-2;x++) {
             if('1'==bitmaskString.charAt(x)) {
-                String patientId = patientIds.get(x-2).trim();
+                String patientId = getPatientIds().get(x-2).trim();
                 ids.add(Integer.parseInt(patientId));
             }
         }