diff --git a/ce/03_files_availability.yaml.tt2 b/ce/03_files_availability.yaml.tt2
index 7e9a1f6..7596be3 100644
--- a/ce/03_files_availability.yaml.tt2
+++ b/ce/03_files_availability.yaml.tt2
@@ -17,7 +17,7 @@ file:
 
   /etc/ngcp-config/constants.yml:
     exists: true
-    mode: "0644"
+    mode: "0600"
     owner: root
     group: root
     filetype: file
diff --git a/pro/03_files_availability.yaml.tt2 b/pro/03_files_availability.yaml.tt2
index 7fe9418..6a3eb88 100644
--- a/pro/03_files_availability.yaml.tt2
+++ b/pro/03_files_availability.yaml.tt2
@@ -18,7 +18,7 @@ file:
 
   /etc/ngcp-config/constants.yml:
     exists: true
-    mode: "0644"
+    mode: "0600"
     owner: root
     group: root
     filetype: file