diff --git a/src/materialize-directive.ts b/src/materialize-directive.ts
index 68365e6..80acfba 100644
--- a/src/materialize-directive.ts
+++ b/src/materialize-directive.ts
@@ -29,7 +29,7 @@ declare var Materialize: any;
 
 export interface MaterializeAction {
     action: string;
-    params: [any];
+    params: any[];
 }
 
 @Directive({
@@ -37,7 +37,7 @@ export interface MaterializeAction {
 })
 export class MaterializeDirective implements AfterViewInit,DoCheck,OnChanges,OnDestroy {
 
-    private _params: [any] = null;
+    private _params: any[] = null;
     private _functionName: string = null;
     private previousValue = null;
     private previousDisabled = false;