diff --git a/systems/meta/historic.md b/systems/meta/historic.md
index 49b32e119f217de0adddc5597c664d0e42b99123..7ba1bd83a72c50a601eb028fe9a7c2f8bfb0b907 100644
--- a/systems/meta/historic.md
+++ b/systems/meta/historic.md
@@ -10,7 +10,7 @@ semantic wiki, mathematical web services, and invasive OMDoc editing
 technologies. Furthermore, the group works on the utilization of OMDoc to provide Logic
 Interoperability and to establish scientific Communities of Practice.
  
-{% assign systems = site.pages | where: "layout", "system" | sort: "pillar" | sort: "start_date" %}
+{% assign systems = site.pages | where: "layout", "system" | sort: "start_date" %}
 
 <ul class="collection">
     {% for item in systems %}
diff --git a/systems/meta/orphans.md b/systems/meta/orphans.md
index 4c913f23e512aec74959a581350576b510e5e3ea..6f7b35b547ad5aea3ee96bf8569b0e18e3e50b1b 100644
--- a/systems/meta/orphans.md
+++ b/systems/meta/orphans.md
@@ -9,7 +9,7 @@ to greener pastures (e.g. when they graduate). We put these systems up for adopt
 students. If you are interested, please contact someone from the KWARC group, we would be
 happy to help you understand the development opportunities and get involved. 
 
-{% assign systems = site.pages | where: "layout", "system" | sort: "pillar" | sort: "start_date" %}
+{% assign systems = site.pages | where: "layout", "system" | sort: "start_date" %}
 
 <ul class="collection">
     {% for item in systems %}