diff --git a/configuration/common/certificates.nix b/configuration/common/certificates.nix
index ab443fe..c0c38b4 100644
--- a/configuration/common/certificates.nix
+++ b/configuration/common/certificates.nix
@@ -1,9 +1,11 @@
-{ config, ... }:
+{ config, lib, ... }:
+
+with lib;
 
 {
 
   environment.sessionVariables = {
-    REQUESTS_CA_BUNDLE = config.security.pki.caBundle;
+    REQUESTS_CA_BUNDLE = mkDefault config.security.pki.caBundle;
   };
 
 }