diff --git a/lib/Synergy/Reactor/InABox.pm b/lib/Synergy/Reactor/InABox.pm
index 8dc34a21..b597a3cd 100644
--- a/lib/Synergy/Reactor/InABox.pm
+++ b/lib/Synergy/Reactor/InABox.pm
@@ -159,15 +159,23 @@ command box => {
 
   my %switches = map { my ($k, @rest) = @$_; $k => \@rest } @$switches;
 
+  if (!exists $switches{datacentre}) {
+    if (exists $switches{datacenter}) {
+      $switches{datacentre} = delete $switches{datacenter};
+    }
+    elsif (exists $switches{region}) {
+      $switches{datacentre} = delete $switches{region};
+    }
+  }
+
   # This should be simplified into a more generic "validate and normalize
   # switches" call. -- rjbs, 2023-10-20
+  # I've made this not more generic but more clever: We first normalize to
+  # datacentre above and then check if one of the aliases is still hanging
+  # around which means a duplicate alias was passed. -- lerlacher, 2024-07-27
   # Normalize datacentre
-  if (exists $switches{datacentre} && exists $switches{datacenter}) {
-    return await $event->error_reply("You can't use /datacentre and /datacenter at the same time!");
-  }
-
-  if (exists $switches{datacenter}) {
-    $switches{datacentre} = delete $switches{datacenter};
+  if (exists $switches{datacenter} || exists $switches{region}) {
+    return await $event->error_reply("Please pass only one of /datacenter or /datacentre or /region!");
   }
 
   for my $k (qw( version tag size datacentre )) {