diff --git a/src/Entrust/Traits/EntrustUserTrait.php b/src/Entrust/Traits/EntrustUserTrait.php
index c799bbeb..7ed1a6b6 100644
--- a/src/Entrust/Traits/EntrustUserTrait.php
+++ b/src/Entrust/Traits/EntrustUserTrait.php
@@ -11,6 +11,7 @@
 use Illuminate\Cache\TaggableStore;
 use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\Config;
+use Illuminate\Support\Str;
 use InvalidArgumentException;
 
 trait EntrustUserTrait
@@ -162,7 +163,7 @@ public function can($permission, $requireAll = false)
             foreach ($this->cachedRoles() as $role) {
                 // Validate against the Permission table
                 foreach ($role->cachedPermissions() as $perm) {
-                    if (str_is( $permission, $perm->name) ) {
+                    if (Str::is( $permission, $perm->name) ) {
                         return true;
                     }
                 }