diff --git a/pkgs/data/misc/cacert/setup-hook.sh b/pkgs/data/misc/cacert/setup-hook.sh
index 77b68a5c251c..93b682fbbd12 100644
--- a/pkgs/data/misc/cacert/setup-hook.sh
+++ b/pkgs/data/misc/cacert/setup-hook.sh
@@ -1,3 +1,7 @@
 export NIX_SSL_CERT_FILE=@out@/etc/ssl/certs/ca-bundle.crt
-# left for compatibility
+
+# compatibility
+#  - openssl
 export SSL_CERT_FILE=@out@/etc/ssl/certs/ca-bundle.crt
+#  - Haskell x509-system
+export SYSTEM_CERTIFICATE_PATH=@out@/etc/ssl/certs/ca-bundle.crt