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-rw-r--r--nixos/tests/postfix.nix6
1 files changed, 3 insertions, 3 deletions
diff --git a/nixos/tests/postfix.nix b/nixos/tests/postfix.nix
index 29e263cd7e78d..6d22b4edba0a2 100644
--- a/nixos/tests/postfix.nix
+++ b/nixos/tests/postfix.nix
@@ -11,9 +11,9 @@ import ./make-test-python.nix {
       enable = true;
       enableSubmission = true;
       enableSubmissions = true;
-      tlsTrustedAuthorities = certs.ca.cert;
-      sslCert = certs.${domain}.cert;
-      sslKey = certs.${domain}.key;
+      tlsTrustedAuthorities = "${certs.ca.cert}";
+      sslCert = "${certs.${domain}.cert}";
+      sslKey = "${certs.${domain}.key}";
       submissionsOptions = {
           smtpd_sasl_auth_enable = "yes";
           smtpd_client_restrictions = "permit";