diff --git a/src/models/client.ts b/src/models/client.ts
index 4aff966..f1ff54a 100644
--- a/src/models/client.ts
+++ b/src/models/client.ts
@@ -368,8 +368,6 @@ export function slashModule() {
   return function (client: Client | SlashClient, prop: string) {
     if (client._decoratedSlashModules === undefined)
       client._decoratedSlashModules = []
-
-    const mod = ((client as unknown) as { [key: string]: any })[prop]
-    client._decoratedSlashModules.push(mod)
+    client._decoratedSlashModules.push(prop)
   }
 }
diff --git a/src/models/slashClient.ts b/src/models/slashClient.ts
index 06beaef..f2e550b 100644
--- a/src/models/slashClient.ts
+++ b/src/models/slashClient.ts
@@ -398,6 +398,10 @@ export class SlashClient {
     if (this._decoratedSlashModules !== undefined) {
       this._decoratedSlashModules.forEach((e) => {
         const mod = ((this as unknown) as { [name: string]: SlashModule })[e]
+        if (!(mod instanceof SlashModule))
+          throw new Error(
+            '@slashModule can only be used on SlashModule instances'
+          )
         this.modules.push(mod)
       })
     }