diff --git a/packages/telescope-posts/lib/parameters.js b/packages/telescope-posts/lib/parameters.js
index d1f2bddad..a44181b9a 100644
--- a/packages/telescope-posts/lib/parameters.js
+++ b/packages/telescope-posts/lib/parameters.js
@@ -38,7 +38,11 @@ Posts.getSubParams = function (terms) {
   if (!parameters.showFuture && !parameters.find.postedAt)
     parameters.find.postedAt = {$lte: new Date()};
 
+  // filter by category if category _id is provided
+  if(!!terms.category)
+    parameters.find.categories = {$in: [terms.category]};
+  
   // console.log(parameters);
 
   return parameters;
-};
\ No newline at end of file
+};