diff --git a/lib/index.js b/lib/index.js
index 8823650..d4becdd 100755
--- a/lib/index.js
+++ b/lib/index.js
@@ -63,10 +63,13 @@ function maskField(field, fn) {
   }
 
   field[Processed] = true;
-  field.resolve = async function (...args) {
+  field.resolve = function (...args) {
     try {
-      const out = resolveFn.call(this, ...args);
-      return await Promise.resolve(out);
+      let out = resolveFn.call(this, ...args);
+      if (out && typeof out.then === 'function') {
+        out = out.then(undefined, e => fn(e, args));
+      }
+      return out;
     } catch (e) {
       throw fn(e, args);
     }