diff --git a/packages/gatsby-theme-egghead-blog/gatsby-node.js b/packages/gatsby-theme-egghead-blog/gatsby-node.js
index 5102e60..3eab44f 100644
--- a/packages/gatsby-theme-egghead-blog/gatsby-node.js
+++ b/packages/gatsby-theme-egghead-blog/gatsby-node.js
@@ -184,5 +184,11 @@ exports.onCreateNode = ({ node, getNode, actions }) => {
       node,
       value: node.frontmatter.redirects,
     })
+
+    createNodeField({
+      name: 'isPost',
+      node,
+      value: true,
+    })
   }
 }
diff --git a/packages/gatsby-theme-egghead-blog/src/templates/blog.js b/packages/gatsby-theme-egghead-blog/src/templates/blog.js
index 46e1ecc..c471875 100644
--- a/packages/gatsby-theme-egghead-blog/src/templates/blog.js
+++ b/packages/gatsby-theme-egghead-blog/src/templates/blog.js
@@ -18,8 +18,7 @@ const Blog = ({
     .map(id =>
       allMdx.edges.find(
         edge =>
-          edge.node.id === id &&
-          edge.node.parent.sourceInstanceName !== 'pages',
+          edge.node.id === id
       ),
     )
     .filter(post => post !== undefined)
@@ -131,7 +130,10 @@ export const pageQuery = graphql`
     site {
       ...site
     }
-    allMdx(sort: { fields: [frontmatter___date], order: DESC }) {
+    allMdx(
+      sort: { fields: [frontmatter___date], order: DESC }
+      filter: { fields: { isPost: { eq: true } } }
+    ) {
       edges {
         node {
           excerpt(pruneLength: 300)
@@ -141,11 +143,6 @@ export const pageQuery = graphql`
             slug
             date
           }
-          parent {
-            ... on File {
-              sourceInstanceName
-            }
-          }
           frontmatter {
             title
             date(formatString: "MMMM DD, YYYY")