diff --git a/nixos/modules/system/activation/switch-to-configuration.pl b/nixos/modules/system/activation/switch-to-configuration.pl
index de6e43dd30d8..a77a6ed52ebb 100755
--- a/nixos/modules/system/activation/switch-to-configuration.pl
+++ b/nixos/modules/system/activation/switch-to-configuration.pl
@@ -655,7 +655,7 @@ foreach my $device (keys(%{$cur_swaps})) {
         # "systemctl stop" here because systemd has lots of alias
         # units that prevent a stop from actually calling
         # "swapoff".
-        if ($action ne "dry-activate") {
+        if ($action eq "dry-activate") {
             print STDERR "would stop swap device: $device\n";
         } else {
             print STDERR "stopping swap device: $device\n";