--- a/dom/media/PeerConnection.jsm
+++ b/dom/media/PeerConnection.jsm
@@ -1623,17 +1623,17 @@ class RTCPeerConnection {
       id = null;
     } else if (id === null) {
       throw new this._win.DOMException(
           "id is required when negotiated is true", "TypeError");
     }
     if (maxPacketLifeTime !== undefined && maxRetransmits !== undefined) {
       throw new this._win.DOMException(
           "Both maxPacketLifeTime and maxRetransmits cannot be provided",
-          "InvalidParameterError");
+          "TypeError");
     }
     if (id == 65535) {
       throw new this._win.DOMException(
           "id cannot be 65535", "TypeError");
     }
     // Must determine the type where we still know if entries are undefined.
     let type;
     if (maxPacketLifeTime !== undefined) {

--- a/testing/web-platform/meta/webrtc/RTCPeerConnection-createDataChannel.html.ini
+++ b/testing/web-platform/meta/webrtc/RTCPeerConnection-createDataChannel.html.ini
@@ -2,20 +2,16 @@
   [createDataChannel attribute default values]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1529695
 
   [createDataChannel with provided parameters should initialize attributes to provided values]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531900
 
-  [createDataChannel with both maxPacketLifeTime and maxRetransmits should throw SyntaxError]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531894
-
   [createDataChannel with negotiated true should succeed]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1529695
 
   [createDataChannel with priority "high" should succeed]
     expected: FAIL
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1531100
 
@@ -40,19 +36,16 @@
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1526253
 
   [createDataChannel with negotiated false should succeed]
     expected: FAIL
 
   [createDataChannel with negotiated false and id 42 should ignore the id]
     expected: FAIL
 
-  [createDataChannel with both maxPacketLifeTime and maxRetransmits should throw TypeError]
-    expected: FAIL
-
   [Reusing a data channel id that is in use (after setRemoteDescription, negotiated via DCEP) should throw OperationError]
     expected: FAIL
 
   [Reusing a data channel id that is in use (after setRemoteDescription) should throw OperationError]
     expected: FAIL
 
   [New data channel should be in the connecting state after creation (after connection establishment)]
     expected: FAIL