diff --git a/nextflow/src/org/labkey/nextflow/NextFlowController.java b/nextflow/src/org/labkey/nextflow/NextFlowController.java
index ed9600c7..f22af232 100644
--- a/nextflow/src/org/labkey/nextflow/NextFlowController.java
+++ b/nextflow/src/org/labkey/nextflow/NextFlowController.java
@@ -212,7 +212,7 @@ public ModelAndView getView(Object form, boolean reshow, BindException errors) t
         public boolean handlePost(Object form, BindException errors) throws Exception
         {
             PropertyStore store = PropertyManager.getNormalStore();
-            PropertyManager.PropertyMap map = store.getWritableProperties(NextFlowManager.NEXTFLOW_ENABLE, true);
+            PropertyManager.WritablePropertyMap map = store.getWritableProperties(NextFlowManager.NEXTFLOW_ENABLE, true);
             if (map.isEmpty())
             {
                 map.put(IS_NEXTFLOW_ENABLED, Boolean.TRUE.toString());
diff --git a/nextflow/src/org/labkey/nextflow/NextFlowManager.java b/nextflow/src/org/labkey/nextflow/NextFlowManager.java
index a6f175e7..23684b32 100644
--- a/nextflow/src/org/labkey/nextflow/NextFlowManager.java
+++ b/nextflow/src/org/labkey/nextflow/NextFlowManager.java
@@ -94,7 +94,7 @@ private void saveConfiguration( NextFlowController.NextFlowConfiguration configu
             properties.put(NEXTFLOW_S3_BUCKET_PATH, configuration.getS3BucketPath());
             properties.put(NEXTFLOW_ACCOUNT_NAME, configuration.getAccountName());
 
-            PropertyManager.PropertyMap props = _encryptedStore.getWritableProperties(NEXTFLOW_CONFIG, true);
+            PropertyManager.WritablePropertyMap props = _encryptedStore.getWritableProperties(NEXTFLOW_CONFIG, true);
             props.clear();
             props.putAll(properties);
             props.save();