diff --git a/src/components/fields/_DataProperty.jsx b/src/components/fields/_DataProperty.jsx
index d2bbaba4..73f0c4d5 100644
--- a/src/components/fields/_DataProperty.jsx
+++ b/src/components/fields/_DataProperty.jsx
@@ -40,6 +40,7 @@ export default class DataProperty extends React.Component {
     onDeleteStop: PropTypes.func,
     onAddStop: PropTypes.func,
     fieldName: PropTypes.string,
+    fieldType: PropTypes.string,
     fieldSpec: PropTypes.object,
     value: PropTypes.oneOfType([
       PropTypes.object,
diff --git a/src/components/fields/_ExpressionProperty.jsx b/src/components/fields/_ExpressionProperty.jsx
index 8c5ab96a..d00dfd6b 100644
--- a/src/components/fields/_ExpressionProperty.jsx
+++ b/src/components/fields/_ExpressionProperty.jsx
@@ -15,6 +15,7 @@ export default class ExpressionProperty extends React.Component {
   static propTypes = {
     onDelete: PropTypes.func,
     fieldName: PropTypes.string,
+    fieldType: PropTypes.string,
     fieldSpec: PropTypes.object,
     value: PropTypes.any,
     errors: PropTypes.object,