diff --git a/src/engine/imap/command/imap-starttls-command.vala b/src/engine/imap/command/imap-starttls-command.vala
index 48a9d4b5..528f9f24 100644
--- a/src/engine/imap/command/imap-starttls-command.vala
+++ b/src/engine/imap/command/imap-starttls-command.vala
@@ -9,7 +9,7 @@
  */
 
 public class Geary.Imap.StarttlsCommand : Command {
-    public const string NAME = "starttls";
+    public const string NAME = "STARTTLS";
     
     public StarttlsCommand() {
         base (NAME);
diff --git a/src/engine/smtp/smtp-command.vala b/src/engine/smtp/smtp-command.vala
index 47db7648..120eaa4f 100644
--- a/src/engine/smtp/smtp-command.vala
+++ b/src/engine/smtp/smtp-command.vala
@@ -50,7 +50,7 @@ public enum Geary.Smtp.Command {
                 return "data";
 
             case STARTTLS:
-                return "starttls";
+                return "STARTTLS";
 
             default:
                 assert_not_reached();