diff --git a/lib/mssql.js b/lib/mssql.js
index 947bf90..3042328 100644
--- a/lib/mssql.js
+++ b/lib/mssql.js
@@ -8,7 +8,7 @@ const TYPES = mssql.TYPES;
 
 const pools = new Map();
 
-const READ_ONLY = new Set(["SELECT", "USAGE"]);
+const READ_ONLY = new Set(["SELECT", "USAGE", "CONNECT"]);
 
 const ajv = new Ajv();
 const validate = ajv.compile({