diff --git a/nixos/modules/system/activation/switch-to-configuration.pl b/nixos/modules/system/activation/switch-to-configuration.pl
index 093b7f1ff22..bb97d0c53a6 100644
--- a/nixos/modules/system/activation/switch-to-configuration.pl
+++ b/nixos/modules/system/activation/switch-to-configuration.pl
@@ -261,7 +261,7 @@ while (my ($unit, $state) = each %{$activePrev}) {
 
 sub pathToUnitName {
     my ($path) = @_;
-    open my $cmd, "-|", "systemd-escape", "--suffix=mount", "-p", $path
+    open my $cmd, "-|", "@systemd@/bin/systemd-escape", "--suffix=mount", "-p", $path
         or die "Unable to escape $path!\n";
     my $escaped = join "", <$cmd>;
     chomp $escaped;