diff --git a/SingularityBase/src/main/java/com/hubspot/mesos/SingularityVolume.java b/SingularityBase/src/main/java/com/hubspot/mesos/SingularityVolume.java
index 2dbd21bbcc..09c8edda1c 100644
--- a/SingularityBase/src/main/java/com/hubspot/mesos/SingularityVolume.java
+++ b/SingularityBase/src/main/java/com/hubspot/mesos/SingularityVolume.java
@@ -9,13 +9,13 @@
 public class SingularityVolume {
   private final String containerPath;
   private final Optional<String> hostPath;
-  private final Mode mode;
+  private final Optional<Mode> mode;
 
   @JsonCreator
   public SingularityVolume(
       @JsonProperty("containerPath") String containerPath,
       @JsonProperty("hostPath") Optional<String> hostPath,
-      @JsonProperty("mode") Mode mode) {
+      @JsonProperty("mode") Optional<Mode> mode) {
     this.containerPath = containerPath;
     this.hostPath = hostPath;
     this.mode = mode;
@@ -29,7 +29,7 @@ public Optional<String> getHostPath() {
     return hostPath;
   }
 
-  public Mode getMode() {
+  public Optional<Mode> getMode() {
     return mode;
   }
 
diff --git a/SingularityService/src/main/java/com/hubspot/singularity/mesos/SingularityMesosTaskBuilder.java b/SingularityService/src/main/java/com/hubspot/singularity/mesos/SingularityMesosTaskBuilder.java
index 8d41765fbd..90717dba24 100644
--- a/SingularityService/src/main/java/com/hubspot/singularity/mesos/SingularityMesosTaskBuilder.java
+++ b/SingularityService/src/main/java/com/hubspot/singularity/mesos/SingularityMesosTaskBuilder.java
@@ -220,7 +220,9 @@ private void prepareContainerInfo(final SingularityTaskId taskId, final TaskInfo
       if (volumeInfo.getHostPath().isPresent()) {
         volumeBuilder.setHostPath(fillInTaskIdValues(volumeInfo.getHostPath().get(), taskId));
       }
-      volumeBuilder.setMode(volumeInfo.getMode());
+      if (volumeInfo.getMode().isPresent()) {
+        volumeBuilder.setMode(volumeInfo.getMode().get());
+      }
       containerBuilder.addVolumes(volumeBuilder);
     }