diff --git a/actions/newmessage.php b/actions/newmessage.php
index dd7c5357ba..fa1922c4a0 100644
--- a/actions/newmessage.php
+++ b/actions/newmessage.php
@@ -175,7 +175,7 @@ class NewmessageAction extends Action
             return;
         } else if ($user->id == $this->other->id) {
             // TRANS: Client error displayed trying to send a direct message to self.
-            $this->clientError(_('Don\'t send a message to yourself; ' .
+            $this->clientError(_('Do not send a message to yourself; ' .
                 'just say it to yourself quietly instead.'), 403);
             return;
         }
diff --git a/lib/command.php b/lib/command.php
index fcc21cc5e5..f51cbbb5f7 100644
--- a/lib/command.php
+++ b/lib/command.php
@@ -629,7 +629,7 @@ class MessageCommand extends Command
             return;
         } else if ($this->user->id == $other->id) {
             // TRANS: Error text shown when trying to send a direct message to self.
-            $channel->error($this->user, _('Don\'t send a message to yourself; just say it to yourself quietly instead.'));
+            $channel->error($this->user, _('Do not send a message to yourself; just say it to yourself quietly instead.'));
             return;
         }
         $message = Message::saveNew($this->user->id, $other->id, $this->text, $channel->source());