diff --git a/config/schema/search_api_solr.backend.schema.yml b/config/schema/search_api_solr.backend.schema.yml
index a9b2481..2e8e3be 100644
--- a/config/schema/search_api_solr.backend.schema.yml
+++ b/config/schema/search_api_solr.backend.schema.yml
@@ -68,8 +68,8 @@ search_api.backend.plugin.search_api_solr:
           type: string
           label: 'Use Get or Post for the Solr Queries'
         site_hash:
-          type: string
-          label: 'Site hash'
+          type: boolean
+          label: 'Restrict searches to current site'
     solr_version:
       type: string
       label: 'Solr version override'