diff --git a/src/Illuminate/Validation/Concerns/ValidatesAttributes.php b/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
index 8f88aa2cd8df..ef71f0fdc576 100644
--- a/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
@@ -1554,7 +1554,7 @@ public function parseDependentRuleParameters($parameters)
 
         $values = array_slice($parameters, 1);
 
-        if (is_bool($other)) {
+        if ($this->shouldConvertToBoolean($parameters[0]) || is_bool($other)) {
             $values = $this->convertValuesToBoolean($values);
         } elseif (is_null($other)) {
             $values = $this->convertValuesToNull($values);
@@ -1563,6 +1563,19 @@ public function parseDependentRuleParameters($parameters)
         return [$values, $other];
     }
 
+    /**
+     * Check if parameter should be converted to boolean.
+     *
+     * @param $parameter
+     * @return bool
+     */
+    protected function shouldConvertToBoolean($parameter)
+    {
+        $rules = Arr::get($this->rules, $parameter, []);
+
+        return in_array('boolean', $rules);
+    }
+
     /**
      * Convert the given values to boolean if they are string "true" / "false".
      *