diff --git a/src/Command.ts b/src/Command.ts
index 2d0a248..54a39d1 100644
--- a/src/Command.ts
+++ b/src/Command.ts
@@ -148,7 +148,7 @@ export class Command {
                     name: p.name,
                     description: p.description || "No description",
                     required: !p.optional,
-                    type: type,
+                    type: p.choices ? 3 : type,
                     choices:
                         p.choices?.map((c) => {
                             return { name: c, value: c };
diff --git a/src/CommandManager.ts b/src/CommandManager.ts
index b545e95..05a18fc 100644
--- a/src/CommandManager.ts
+++ b/src/CommandManager.ts
@@ -64,6 +64,12 @@ export class CommandManager {
                         ar.splice(i, 1);
                     }
                 });
+            command.parameters &&
+                command.parameters.map((p) => {
+                    if (p.type != "string" && p.choices) {
+                        throw new Error('Parameter with defined choices must have a "string" type');
+                    }
+                });
             this.list.push(command);
             return true;
         } catch (e) {