diff --git a/gatsby-node.js b/gatsby-node.js
index 9abc051..c0d95f9 100644
--- a/gatsby-node.js
+++ b/gatsby-node.js
@@ -404,9 +404,8 @@ exports.createResolvers = function (_ref7) {
 
           return nodesData;
         } else {
-          return context.nodeModel.getNodeById({
-            id: source[fileField.field.uid + '___NODE']
-          });
+          var id = source[fileField.field.uid + '___NODE'];
+          return context.nodeModel.getNodeById({ id: id });
         }
       }
     }));
diff --git a/src/gatsby-node.js b/src/gatsby-node.js
index 47b207f..2832ea0 100644
--- a/src/gatsby-node.js
+++ b/src/gatsby-node.js
@@ -361,9 +361,8 @@ exports.createResolvers = ({ createResolvers }) => {
 
               return nodesData;
             } else { 
-              return context.nodeModel.getNodeById({
-                id: source[`${fileField.field.uid}___NODE`]
-              })
+              const id = source[`${fileField.field.uid}___NODE`]
+              return context.nodeModel.getNodeById({ id })
             }
         },
       },