diff --git a/tests/test.class.StringBuilder.php b/tests/test.class.StringBuilder.php
index d3667e4..e17d6d0 100644
--- a/tests/test.class.StringBuilder.php
+++ b/tests/test.class.StringBuilder.php
@@ -87,7 +87,7 @@ class StringBuilderTest extends TestCase {
     public function testPrependDuplicateString() {
         $sb = new \NAE\String\StringBuilder();
         $sb->prepend("test1")->prepend("test2")->prepend("test1");
-        $this->assertEquals($sb->getParts(), ["test2", "test1"]);
+        $this->assertEquals($sb->getParts(), ["test1", "test2", "test1"]);
     }
 
     public function testSuffix() {