diff --git a/dom/webidl/DOMMMIError.webidl b/dom/webidl/DOMMMIError.webidl
index cf3822c5e6c3..13fa22c4af4d 100644
--- a/dom/webidl/DOMMMIError.webidl
+++ b/dom/webidl/DOMMMIError.webidl
@@ -4,13 +4,15 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-[JSImplementation="@mozilla.org/dom/mmi-error;1",
+[Pref="dom.mobileconnection.enabled",
  Constructor(DOMString serviceCode,
              DOMString name,
              optional DOMString message = "",
-             optional DOMString additionalInformation = "")]
+             optional short? additionalInformation = null)]
 interface DOMMMIError : DOMError {
+  [Constant]
   readonly attribute DOMString serviceCode;
 
-  readonly attribute any additionalInformation;
+  [Constant]
+  readonly attribute short? additionalInformation;
 };
diff --git a/dom/webidl/moz.build b/dom/webidl/moz.build
index ac1bd8d3e1e0..14c88bd62d47 100644
--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -84,7 +84,6 @@ WEBIDL_FILES = [
     'DOMError.webidl',
     'DOMException.webidl',
     'DOMImplementation.webidl',
-    'DOMMMIError.webidl',
     'DOMParser.webidl',
     'DOMPoint.webidl',
     'DOMQuad.webidl',
@@ -544,6 +543,7 @@ if CONFIG['MOZ_B2G_BT']:
 
 if CONFIG['MOZ_B2G_RIL']:
     WEBIDL_FILES += [
+        'DOMMMIError.webidl',
         'IccCardLockError.webidl',
         'MozCellBroadcast.webidl',
         'MozCellBroadcastEvent.webidl',