diff --git a/Tests/Iterator/DateRangeFilterIteratorTest.php b/Tests/Iterator/DateRangeFilterIteratorTest.php
index 2d8cfb30..5b237c9e 100644
--- a/Tests/Iterator/DateRangeFilterIteratorTest.php
+++ b/Tests/Iterator/DateRangeFilterIteratorTest.php
@@ -22,7 +22,7 @@ class DateRangeFilterIteratorTest extends RealIteratorTestCase
     public function testAccept($size, $expected)
     {
         $files = self::$files;
-        $files[] = self::toAbsolute('doesnotexist');
+        $files[] = static::toAbsolute('doesnotexist');
         $inner = new Iterator($files);
 
         $iterator = new DateRangeFilterIterator($inner, $size);
@@ -84,9 +84,9 @@ public function getAcceptData()
         ];
 
         return [
-            [[new DateComparator('since 20 years ago')], $this->toAbsolute($since20YearsAgo)],
-            [[new DateComparator('since 2 months ago')], $this->toAbsolute($since2MonthsAgo)],
-            [[new DateComparator('until last month')], $this->toAbsolute($untilLastMonth)],
+            [[new DateComparator('since 20 years ago')], static::toAbsolute($since20YearsAgo)],
+            [[new DateComparator('since 2 months ago')], static::toAbsolute($since2MonthsAgo)],
+            [[new DateComparator('until last month')], static::toAbsolute($untilLastMonth)],
         ];
     }
 }