diff --git a/assignment/impl/src/java/org/sakaiproject/assignment/impl/AssignmentServiceImpl.java b/assignment/impl/src/java/org/sakaiproject/assignment/impl/AssignmentServiceImpl.java
index e8813387162d..c8ec7c5ff1d1 100644
--- a/assignment/impl/src/java/org/sakaiproject/assignment/impl/AssignmentServiceImpl.java
+++ b/assignment/impl/src/java/org/sakaiproject/assignment/impl/AssignmentServiceImpl.java
@@ -75,6 +75,7 @@
 import org.sakaiproject.assignment.api.model.AssignmentSubmissionSubmitter;
 import org.sakaiproject.assignment.api.model.AssignmentSupplementItemAttachment;
 import org.sakaiproject.assignment.api.model.AssignmentSupplementItemService;
+import org.sakaiproject.assignment.impl.sort.AnonymousSubmissionComparator;
 import org.sakaiproject.assignment.impl.sort.AssignmentSubmissionComparator;
 import org.sakaiproject.assignment.impl.sort.UserComparator;
 import org.sakaiproject.assignment.persistence.AssignmentRepository;
@@ -1640,13 +1641,18 @@ public void getSubmissionsZip(OutputStream out, String reference, String query)
                     List<AssignmentSubmission> submissions = new ArrayList<AssignmentSubmission>(submitters.values());
 
                     StringBuilder exceptionMessage = new StringBuilder();
-
+                    SortedIterator sortedIterator;
+                    if (assignmentUsesAnonymousGrading(assignment)){
+                        sortedIterator = new SortedIterator(submissions.iterator(), new AnonymousSubmissionComparator());
+                    } else {
+                        sortedIterator = new SortedIterator(submissions.iterator(), new AssignmentSubmissionComparator(applicationContext.getBean(AssignmentService.class), siteService, userDirectoryService));
+                    }
                     if (allowGradeSubmission(reference)) {
                         zipSubmissions(reference,
                                 assignment.getTitle(),
                                 assignment.getTypeOfGrade(),
                                 assignment.getTypeOfSubmission(),
-                                new SortedIterator(submissions.iterator(), new AssignmentSubmissionComparator(applicationContext.getBean(AssignmentService.class), siteService, userDirectoryService)),
+                                sortedIterator,
                                 out,
                                 exceptionMessage,
                                 withStudentSubmissionText,
diff --git a/assignment/tool/src/java/org/sakaiproject/assignment/tool/AssignmentAction.java b/assignment/tool/src/java/org/sakaiproject/assignment/tool/AssignmentAction.java
index 31b76d5bb84f..f139243bfb60 100644
--- a/assignment/tool/src/java/org/sakaiproject/assignment/tool/AssignmentAction.java
+++ b/assignment/tool/src/java/org/sakaiproject/assignment/tool/AssignmentAction.java
@@ -11913,6 +11913,8 @@ protected int sizeResources(SessionState state) {
                             returnResources.add(us);
                         }
                     }
+                    // Have we found an anonymous assignment in the list.
+                    hasOneAnon = hasOneAnon || assignmentService.assignmentUsesAnonymousGrading(assignment);
                 }
                 break;
             }
@@ -11923,6 +11925,7 @@ protected int sizeResources(SessionState state) {
         String sort = "";
         ascending = (String) state.getAttribute(SORTED_ASC);
         sort = (String) state.getAttribute(SORTED_BY);
+
         if (MODE_INSTRUCTOR_GRADE_ASSIGNMENT.equals(mode) || MODE_INSTRUCTOR_GRADE_SUBMISSION.equals(mode)
                 && (sort == null || !sort.startsWith("sorted_grade_submission_by"))) {
             ascending = (String) state.getAttribute(SORTED_GRADE_SUBMISSION_ASC);
@@ -11942,16 +11945,9 @@ protected int sizeResources(SessionState state) {
             if (SORTED_GRADE_SUBMISSION_BY_LASTNAME.equals(sort) &&
                     (MODE_INSTRUCTOR_GRADE_ASSIGNMENT.equals(mode) || MODE_INSTRUCTOR_GRADE_SUBMISSION.equals(mode))) {
                 String aRef = (String) state.getAttribute(EXPORT_ASSIGNMENT_REF);
-                try {
-                    Assignment assignment = assignmentService.getAssignment(aRef);
-                    if (assignment != null) {
-                        Map<String, String> props = assignment.getProperties();
-                        if (props != null) {
-                            ac.setAnon(Boolean.valueOf(props.get(NEW_ASSIGNMENT_CHECK_ANONYMOUS_GRADING)));
-                        }
-                    }
-                } catch (IdUnusedException | PermissionException iue) {
-                    // ignore, continue with default sort
+                Assignment assignment = getAssignment(aRef, "sizeResources", state);
+                if (assignment != null) {
+                    ac.setAnon(assignmentService.assignmentUsesAnonymousGrading(assignment));
                 }
             } else if (hasOneAnon) {
                 ac.setAnon(true);