diff --git a/classes/FixtureBuilder.inc b/classes/FixtureBuilder.inc
index a7c5653..aecf687 100644
--- a/classes/FixtureBuilder.inc
+++ b/classes/FixtureBuilder.inc
@@ -131,10 +131,12 @@ class FixtureBuilder {
 			$category_ids  = array();
 			if (isset($obj['post']['categories'])) {
 				$category_ids_by_slug = array();
+				$category_ids = array();
 				foreach ($obj['post']['categories'] as $category) {
-					$category_ids_by_slug = array_merge($category_ids_by_slug, PostFixtures::create_category($category));
+					$created_categories = PostFixtures::create_category($category);
+					$category_ids[] = array_pop(array_values($created_categories));
+					$category_ids_by_slug = array_merge($category_ids_by_slug, $created_categories);
 				}
-				$category_ids = array_values($category_ids_by_slug);
 				PostFixtures::set_post_categories($post_id, $category_ids);
 			}
 
diff --git a/test/FixtureBuilderTest.php b/test/FixtureBuilderTest.php
index 1399461..711efd4 100644
--- a/test/FixtureBuilderTest.php
+++ b/test/FixtureBuilderTest.php
@@ -132,7 +132,7 @@ class FixtureBuilderTest extends PHPUnit_Framework_TestCase {
 					),
 					array(
 						'categories',
-						array('test')
+						array('test/test2')
 					),
 					array(
 						'metadata',
@@ -163,7 +163,8 @@ class FixtureBuilderTest extends PHPUnit_Framework_TestCase {
 						)
 					),
 					'categories' => array(
-						1 => 'test'
+						1 => 'test',
+						2 => 'test2'
 					),
 					'tags' => array(
 						1 => array('tag1', 'tag2')
@@ -172,6 +173,9 @@ class FixtureBuilderTest extends PHPUnit_Framework_TestCase {
 						1 => array(
 							'test' => 'test2'
 						)
+					),
+					'post_categories' => array(
+						1 => array(2)
 					)
 				)
 			),
@@ -208,6 +212,11 @@ class FixtureBuilderTest extends PHPUnit_Framework_TestCase {
 						}
 					}
 					break;
+				case 'post_categories':
+					foreach ($info as $post_id => $expected_categories) {
+						$this->assertEquals($expected_categories, wp_get_post_categories($post_id));
+					}
+					break;
 			}
 		}