diff --git a/test.ts b/test.ts
index 41eb9c1..8483089 100644
--- a/test.ts
+++ b/test.ts
@@ -90,7 +90,7 @@ type TerraformStateResource = {
   type: string;
   name: string;
   provider: string;
-  instances: [{ attributes: Record<string, any> }];
+  instances: [{ attributes: Record<string, JsonValue> }];
 };
 
 export interface TerraformState {
diff --git a/windows-rdp/main.test.ts b/windows-rdp/main.test.ts
index 80cbfbe..34a8e52 100644
--- a/windows-rdp/main.test.ts
+++ b/windows-rdp/main.test.ts
@@ -23,7 +23,10 @@ function findWindowsRdpScript(state: TerraformState): string | null {
     }
 
     for (const instance of resource.instances) {
-      if (instance.attributes.display_name === "windows-rdp") {
+      if (
+        instance.attributes.display_name === "windows-rdp" &&
+        typeof instance.attributes.script === "string"
+      ) {
         return instance.attributes.script;
       }
     }