diff --git a/index.d.ts b/index.d.ts
index d0fc7214..2a657460 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,7 +1,7 @@
 export function parse(connectionString: string): ConnectionOptions;
 
 export interface ConnectionOptions {
-  host: string;
+  host: string | null;
   password?: string;
   user?: string;
   port: string | null;