diff --git a/code/widgets/BlogArchiveWidget.php b/code/widgets/BlogArchiveWidget.php
index dc97037..4b8fa92 100644
--- a/code/widgets/BlogArchiveWidget.php
+++ b/code/widgets/BlogArchiveWidget.php
@@ -100,7 +100,8 @@ class BlogArchiveWidget extends Widget
         $query = SQLSelect::create($fields, '"BlogPost' . $suffix . '"')
             ->addGroupBy($publishDate)
             ->addOrderBy('"PublishDate" DESC')
-            ->addWhere(array('"PublishDate" <= ?' => SS_Datetime::now()->Format('Y-m-d H:i:s')));
+            ->addLeftJoin('SiteTree' . $suffix, '"SiteTree' . $suffix . '"."ID" = "BlogPost' . $suffix . '"."ID"')
+            ->addWhere(array('"PublishDate" <= ?' => SS_Datetime::now()->Format('Y-m-d H:i:s'), '"SiteTree' . $suffix . '"."ParentID"' => $this->BlogID));
 
         $posts = $query->execute();
         $result = new ArrayList();
diff --git a/tests/Widgets/BlogArchiveWidgetTest.php b/tests/Widgets/BlogArchiveWidgetTest.php
index 5cdf7e4..b641a61 100644
--- a/tests/Widgets/BlogArchiveWidgetTest.php
+++ b/tests/Widgets/BlogArchiveWidgetTest.php
@@ -26,16 +26,26 @@ class BlogArchiveWidgetTest extends SapphireTest
 
     public function testArchiveMonthlyFromStage()
     {
-        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly');
-        $archive = $widget->getArchive();
+        $widgetA = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly-a');
+        $archiveA = $widgetA->getArchive();
 
-        $this->assertInstanceOf('SS_List', $archive);
-        $this->assertCount(3, $archive);
+        $this->assertInstanceOf('SS_List', $archiveA);
+        $this->assertCount(3, $archiveA);
         $this->assertDOSContains(array(
             array('Title' => 'August 2017'),
             array('Title' => 'September 2017'),
             array('Title' => 'May 2015'),
-        ), $archive);
+        ), $archiveA);
+
+        $widgetB = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly-b');
+        $archiveB = $widgetB->getArchive();
+
+        $this->assertInstanceOf('SS_List', $archiveB);
+        $this->assertCount(2, $archiveB);
+        $this->assertDOSContains(array(
+            array('Title' => 'March 2016'),
+            array('Title' => 'June 2016'),
+        ), $archiveB);
     }
 
     public function testArchiveMonthlyFromLive()
@@ -45,7 +55,7 @@ class BlogArchiveWidgetTest extends SapphireTest
         $this->objFromFixture('BlogPost', 'post-b')->doPublish();
         Versioned::reading_stage('Live');
 
-        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly');
+        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly-a');
         $archive = $widget->getArchive();
 
         $this->assertCount(1, $archive);
@@ -60,15 +70,24 @@ class BlogArchiveWidgetTest extends SapphireTest
 
     public function testArchiveYearly()
     {
-        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-yearly');
-        $archive = $widget->getArchive();
+        $widgetA = $this->objFromFixture('BlogArchiveWidget', 'archive-yearly-a');
+        $archiveA = $widgetA->getArchive();
 
-        $this->assertInstanceOf('SS_List', $archive);
-        $this->assertCount(2, $archive);
+        $this->assertInstanceOf('SS_List', $archiveA);
+        $this->assertCount(2, $archiveA);
         $this->assertDOSContains(array(
             array('Title' => '2017'),
             array('Title' => '2015'),
-        ), $archive);
+        ), $archiveA);
+
+        $widgetB = $this->objFromFixture('BlogArchiveWidget', 'archive-yearly-b');
+        $archiveB = $widgetB->getArchive();
+
+        $this->assertInstanceOf('SS_List', $archiveB);
+        $this->assertCount(1, $archiveB);
+        $this->assertDOSContains(array(
+            array('Title' => '2016'),
+        ), $archiveB);
     }
 
     public function testArchiveMonthlyWithNewPostsAdded()
@@ -76,7 +95,7 @@ class BlogArchiveWidgetTest extends SapphireTest
         $original = Versioned::current_stage();
         Versioned::reading_stage('Stage');
 
-        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly');
+        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly-a');
         $archive = $widget->getArchive();
 
         $this->assertCount(3, $archive, 'Three months are shown in the blog archive list from fixtures');
@@ -84,7 +103,7 @@ class BlogArchiveWidgetTest extends SapphireTest
         SS_Datetime::set_mock_now('2018-01-01 12:00:00');
 
         $newPost = new BlogPost;
-        $newPost->ParentID = $this->objFromFixture('Blog', 'my-blog')->ID;
+        $newPost->ParentID = $this->objFromFixture('Blog', 'blog-a')->ID;
         $newPost->Title = 'My new blog post';
         $newPost->PublishDate = '2018-01-01 08:00:00'; // Same day as the mocked now, but slightly earlier
         $newPost->write();
diff --git a/tests/Widgets/BlogArchiveWidgetTest.yml b/tests/Widgets/BlogArchiveWidgetTest.yml
index 4126956..d457af1 100644
--- a/tests/Widgets/BlogArchiveWidgetTest.yml
+++ b/tests/Widgets/BlogArchiveWidgetTest.yml
@@ -1,27 +1,45 @@
 Blog:
-  my-blog:
-    Title: My Blog
+  blog-a:
+    Title: Blog A
+  blog-b:
+    Title: Blog B
 
 BlogPost:
   post-a:
     Title: September Digest
     PublishDate: 2017-09-01 00:00:00
-    ParentID: =>Blog.my-blog
+    ParentID: =>Blog.blog-a
   post-b:
     Title: August is Awesome
     PublishDate: 2017-08-01 00:00:00
-    ParentID: =>Blog.my-blog
+    ParentID: =>Blog.blog-a
   post-c:
     Title: 2015 is so two years ago
     PublishDate: 2015-05-02 00:01:02
-    ParentID: =>Blog.my-blog
+    ParentID: =>Blog.blog-a
+  post-d:
+    Title: Blog post on Blog B
+    PublishDate: 2016-03-13 21:05:36
+    ParentID: =>Blog.blog-b
+  post-e:
+    Title: Blog post 2 on Blog B
+    PublishDate: 2016-06-15 10:00:00
+    ParentID: =>Blog.blog-b
 
 BlogArchiveWidget:
-  archive-monthly:
+  archive-monthly-a:
     NumberToDisplay: 5
     ArchiveType: Monthly
-    BlogID: =>Blog.my-blog
-  archive-yearly:
+    BlogID: =>Blog.blog-a
+  archive-monthly-b:
+    NumberToDisplay: 5
+    ArchiveType: Monthly
+    BlogID: =>Blog.blog-b
+  archive-yearly-a:
     NumberToDisplay: 5
     ArchiveType: Yearly
-    BlogID: =>Blog.my-blog
+    BlogID: =>Blog.blog-a
+  archive-yearly-b:
+    NumberToDisplay: 5
+    ArchiveType: Yearly
+    BlogID: =>Blog.blog-b