diff --git a/lib/apiRoutes.js b/lib/apiRoutes.js
index ad87a24f..8bc2d2d9 100644
--- a/lib/apiRoutes.js
+++ b/lib/apiRoutes.js
@@ -28,13 +28,19 @@ module.exports = self => {
 
         return [ ...new Set(relatedTypes) ];
 
-        // TODO: do not include types that have the `relatedDocument = false`
         // option in their module configuration
         function searchRelationships(obj) {
           const shouldRecurse = recursions <= maxRecursions;
 
           if (obj.type === 'relationship') {
-            return obj.withType;
+            // Filter out types that has the `relatedDocument` option set to `false` in their module.
+            // Use `default-page` because this option is set on the page-type module,
+            // which does not actually exist inside `apos.modules`:
+            const module = obj.withType === '@apostrophecms/page'
+              ? 'default-page'
+              : obj.withType;
+
+            return self.apos.modules[module].options.relatedDocument === false && obj.withType;
           } else if (obj.type === 'array' || obj.type === 'object') {
             recursions++;
             return shouldRecurse && obj.schema.flatMap(searchRelationships);
diff --git a/lib/methods/export.js b/lib/methods/export.js
index e50c4c14..59b2d49b 100644
--- a/lib/methods/export.js
+++ b/lib/methods/export.js
@@ -164,7 +164,7 @@ module.exports = self => {
       // never be considered "related" to other pages simply because
       // of navigation links, the feature is meant for pieces that feel more like
       // part of the document being localized)
-      return related.filter(doc => self.apos.modules[doc.type].relatedDocument !== false);
+      return related.filter(doc => self.apos.modules[doc.type].options.relatedDocument !== false);
     }
   };
 };