diff --git a/src/Plugin/search_api/backend/SearchApiSolrBackend.php b/src/Plugin/search_api/backend/SearchApiSolrBackend.php
index 7eebda7..51d161e 100644
--- a/src/Plugin/search_api/backend/SearchApiSolrBackend.php
+++ b/src/Plugin/search_api/backend/SearchApiSolrBackend.php
@@ -729,6 +729,11 @@ class SearchApiSolrBackend extends BackendPluginBase implements SolrBackendInter
       $doc->setField('id', $this->createId($index_id, $id));
       $doc->setField('index_id', $index_id);
 
+      // Add document level boost from Search API item.
+      if ($boost = $item->getBoost()) {
+        $doc->setBoost($boost);
+      }
+
       // Add the site hash and language-specific base URL.
       $doc->setField('hash', SearchApiSolrUtility::getSiteHash());
       $lang = $item->getLanguage();