diff --git a/src/RRuleInterface.php b/src/RRuleInterface.php
index 1cd0a8f..b0a5a53 100755
--- a/src/RRuleInterface.php
+++ b/src/RRuleInterface.php
@@ -49,7 +49,7 @@ interface RRuleInterface extends \ArrayAccess, \Countable, \IteratorAggregate
 	 * 
 	 * @param mixed $date
 	 * @param int $index The index (starts at 1)
-	 * @return DateTimeInterface|null
+	 * @return \DateTimeInterface|null
 	 */
 	public function getNthOccurrenceAfter($date, $index);
 
@@ -68,7 +68,7 @@ interface RRuleInterface extends \ArrayAccess, \Countable, \IteratorAggregate
 	 * 
 	 * @param mixed $date
 	 * @param int $index The index (starts at 1)
-	 * @return DateTimeInterface|null
+	 * @return \DateTimeInterface|null
 	 */
 	public function getNthOccurrenceBefore($date, $index);
 
@@ -77,7 +77,7 @@ interface RRuleInterface extends \ArrayAccess, \Countable, \IteratorAggregate
 	 * 
 	 * @param mixed $date
 	 * @param int $index 0 returns the date, positive integer returns index in the future, negative in the past
-	 * @return DateTimeInterface|null
+	 * @return \DateTimeInterface|null
 	 */
 	public function getNthOccurrenceFrom($date, $index);
 
@@ -102,4 +102,4 @@ interface RRuleInterface extends \ArrayAccess, \Countable, \IteratorAggregate
 	 * @return bool
 	 */
 	public function isInfinite();
-}
\ No newline at end of file
+}