diff --git a/ember-can/src/ability.ts b/ember-can/src/ability.ts
index eb0715c..1b81a24 100644
--- a/ember-can/src/ability.ts
+++ b/ember-can/src/ability.ts
@@ -25,7 +25,7 @@ export default class EmberObjectAbility extends EmberObject {
    */
   getAbility(
     propertyName: string,
-    model?: Model,
+    model?: Record<string, unknown>,
     properties?: Record<string, unknown>,
   ): unknown {
     const abilityValue = get(this, this.parseProperty(propertyName));
@@ -37,7 +37,3 @@ export default class EmberObjectAbility extends EmberObject {
     return abilityValue;
   }
 }
-
-export interface Model {
-  [key: string]: unknown;
-}
diff --git a/ember-can/src/helpers/can.ts b/ember-can/src/helpers/can.ts
index 5d42bf8..8d37986 100644
--- a/ember-can/src/helpers/can.ts
+++ b/ember-can/src/helpers/can.ts
@@ -4,7 +4,7 @@ import type Ability from '../services/abilities.ts';
 
 interface CanSignature {
   Args: {
-    Positional: never[];
+    Positional: [abilityString: string, model?: Record<string, unknown>];
     Named: Record<string, unknown>;
   };
   Return: boolean;
diff --git a/ember-can/src/helpers/cannot.ts b/ember-can/src/helpers/cannot.ts
index 7c0eeae..09d9bef 100644
--- a/ember-can/src/helpers/cannot.ts
+++ b/ember-can/src/helpers/cannot.ts
@@ -4,7 +4,7 @@ import type Ability from '../services/abilities.ts';
 
 interface CannotSignature {
   Args: {
-    Positional: never[];
+    Positional: [abilityString: string, model?: Record<string, unknown>];
     Named: Record<string, unknown>;
   };
   Return: boolean;
diff --git a/ember-can/src/services/abilities.ts b/ember-can/src/services/abilities.ts
index 8bc917d..6c4d7c8 100644
--- a/ember-can/src/services/abilities.ts
+++ b/ember-can/src/services/abilities.ts
@@ -1,5 +1,5 @@
 import Service from '@ember/service';
-import Ability, { type Model } from '../ability.ts';
+import Ability from '../ability.ts';
 import { assert } from '@ember/debug';
 import { getOwner } from '@ember/application';
 import normalizeAbilityString from '../-private/normalize.ts';
@@ -26,7 +26,7 @@ export default class AbilitiesService extends Service {
    */
   abilityFor(
     abilityName: string,
-    model?: Model,
+    model?: Record<string, unknown>,
     properties: Record<string, unknown> = {},
   ): Ability {
     const AbilityFactory = getOwner(this)?.factoryFor(`ability:${abilityName}`);
@@ -58,7 +58,7 @@ export default class AbilitiesService extends Service {
   valueFor(
     propertyName: string,
     abilityName: string,
-    model?: Model,
+    model?: Record<string, unknown>,
     properties?: Record<string, unknown>,
   ): unknown {
     const ability = this.abilityFor(abilityName, model, properties);
@@ -79,7 +79,7 @@ export default class AbilitiesService extends Service {
    */
   can(
     abilityString: string,
-    model?: Model,
+    model?: Record<string, unknown>,
     properties?: Record<string, unknown>,
   ): boolean {
     const { propertyName, abilityName } = this.parse(abilityString);
@@ -96,7 +96,7 @@ export default class AbilitiesService extends Service {
    */
   cannot(
     abilityString: string,
-    model?: Model,
+    model?: Record<string, unknown>,
     properties?: Record<string, unknown>,
   ): boolean {
     return !this.can(abilityString, model, properties);