diff --git a/src/Illuminate/Validation/Rules/DatabaseRule.php b/src/Illuminate/Validation/Rules/DatabaseRule.php
index 7789008483fa..bdb5408f78df 100644
--- a/src/Illuminate/Validation/Rules/DatabaseRule.php
+++ b/src/Illuminate/Validation/Rules/DatabaseRule.php
@@ -3,6 +3,7 @@
 namespace Illuminate\Validation\Rules;
 
 use Closure;
+use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Str;
 
@@ -81,12 +82,12 @@ public function resolveTableName($table)
      * Set a "where" constraint on the query.
      *
      * @param  \Closure|string  $column
-     * @param  array|string|int|null  $value
+     * @param  \Illuminate\Contracts\Support\Arrayable|array|string|int|null  $value
      * @return $this
      */
     public function where($column, $value = null)
     {
-        if (is_array($value)) {
+        if ($value instanceof Arrayable || is_array($value)) {
             return $this->whereIn($column, $value);
         }
 
@@ -107,12 +108,12 @@ public function where($column, $value = null)
      * Set a "where not" constraint on the query.
      *
      * @param  string  $column
-     * @param  array|string  $value
+     * @param  \Illuminate\Contracts\Support\Arrayable|array|string  $value
      * @return $this
      */
     public function whereNot($column, $value)
     {
-        if (is_array($value)) {
+        if ($value instanceof Arrayable || is_array($value)) {
             return $this->whereNotIn($column, $value);
         }
 
@@ -145,10 +146,10 @@ public function whereNotNull($column)
      * Set a "where in" constraint on the query.
      *
      * @param  string  $column
-     * @param  array  $values
+     * @param  \Illuminate\Contracts\Support\Arrayable|array  $values
      * @return $this
      */
-    public function whereIn($column, array $values)
+    public function whereIn($column, $values)
     {
         return $this->where(function ($query) use ($column, $values) {
             $query->whereIn($column, $values);
@@ -159,10 +160,10 @@ public function whereIn($column, array $values)
      * Set a "where not in" constraint on the query.
      *
      * @param  string  $column
-     * @param  array  $values
+     * @param  \Illuminate\Contracts\Support\Arrayable|array  $values
      * @return $this
      */
-    public function whereNotIn($column, array $values)
+    public function whereNotIn($column, $values)
     {
         return $this->where(function ($query) use ($column, $values) {
             $query->whereNotIn($column, $values);