diff --git a/t/default-machine-file.t b/t/default-machine-file.t
index 01203a72..d4d3f3df 100644
--- a/t/default-machine-file.t
+++ b/t/default-machine-file.t
@@ -2,7 +2,11 @@ use feature 'unicode_strings';
 use strict;
 use Setup;
 
-my %ctx = test_init();
+my %ctx = test_init(
+  nix_config => q|
+    system-features = test-system-feature
+  |
+);
 
 require Hydra::Schema;
 require Hydra::Model::DB;
diff --git a/t/lib/Setup.pm b/t/lib/Setup.pm
index fc078ac5..b5236978 100644
--- a/t/lib/Setup.pm
+++ b/t/lib/Setup.pm
@@ -48,7 +48,6 @@ sub test_init {
     my $nixconf = "$ENV{'NIX_CONF_DIR'}/nix.conf";
     open(my $fh, '>', $nixconf) or die "Could not open file '$nixconf' $!";
     print $fh "sandbox = false\n";
-    print $fh "system-features = test-system-feature\n";
     print $fh $opts{'nix_config'} || "";
     close $fh;