diff --git a/kong/plugins/oidc/schema.lua b/kong/plugins/oidc/schema.lua
index 6bb01ef9..8d6d3669 100644
--- a/kong/plugins/oidc/schema.lua
+++ b/kong/plugins/oidc/schema.lua
@@ -116,7 +116,7 @@ return {
           }
         },
         {
-          session_secret = {elem
+          session_secret = {
             type = "string",
             required = false
           }