diff --git a/acquia_search/src/PreferredSearchCoreService.php b/acquia_search/src/PreferredSearchCoreService.php
index 98847d1..3b27b95 100644
--- a/acquia_search/src/PreferredSearchCoreService.php
+++ b/acquia_search/src/PreferredSearchCoreService.php
@@ -203,6 +203,11 @@ class PreferredSearchCoreService {
 
       // @TODO: Support for [id]_[env][sitename] cores?
 
+      // On ACSF production enviromments, add .default cores as valid option.
+      if (strpos($ah_env, 'live') && $_SERVER['AH_REALM'] == 'enterprise-g1') {
+        $possible_core_ids[] = $this->acquia_identifier . '.' . $ah_env . '.default';
+      }
+
     }
 
     // For production-only, we allow auto-connecting to the suffix-less core