diff --git a/src/Notifier.ts b/src/Notifier.ts
index 1acd028b08..c03655f209 100644
--- a/src/Notifier.ts
+++ b/src/Notifier.ts
@@ -39,6 +39,7 @@ import { mediaFromMxc } from "./customisations/Media";
 import ErrorDialog from "./components/views/dialogs/ErrorDialog";
 
 import { logger } from "matrix-js-sdk/src/logger";
+import { MsgType } from "matrix-js-sdk/src/@types/event";
 
 /*
  * Dispatches:
@@ -55,8 +56,8 @@ Override both the content body and the TextForEvent handler for specific msgtype
 This is useful when the content body contains fallback text that would explain that the client can't handle a particular
 type of tile.
 */
-const typehandlers = {
-    "m.key.verification.request": (event) => {
+const msgTypeHandlers = {
+    [MsgType.KeyVerificationRequest]: (event) => {
         const name = (event.sender || {}).name;
         return _t("%(name)s is requesting verification", { name });
     },
@@ -71,8 +72,8 @@ export const Notifier = {
     pendingEncryptedEventIds: [],
 
     notificationMessageForEvent: function(ev: MatrixEvent): string {
-        if (typehandlers.hasOwnProperty(ev.getContent().msgtype)) {
-            return typehandlers[ev.getContent().msgtype](ev);
+        if (msgTypeHandlers.hasOwnProperty(ev.getContent().msgtype)) {
+            return msgTypeHandlers[ev.getContent().msgtype](ev);
         }
         return TextForEvent.textForEvent(ev);
     },
@@ -97,7 +98,7 @@ export const Notifier = {
             title = room.name;
             // notificationMessageForEvent includes sender,
             // but we already have the sender here
-            if (ev.getContent().body && !typehandlers.hasOwnProperty(ev.getContent().msgtype)) {
+            if (ev.getContent().body && !msgTypeHandlers.hasOwnProperty(ev.getContent().msgtype)) {
                 msg = ev.getContent().body;
             }
         } else if (ev.getType() === 'm.room.member') {
@@ -108,7 +109,7 @@ export const Notifier = {
             title = ev.sender.name + " (" + room.name + ")";
             // notificationMessageForEvent includes sender,
             // but we've just out sender in the title
-            if (ev.getContent().body && !typehandlers.hasOwnProperty(ev.getContent().msgtype)) {
+            if (ev.getContent().body && !msgTypeHandlers.hasOwnProperty(ev.getContent().msgtype)) {
                 msg = ev.getContent().body;
             }
         }
diff --git a/src/components/views/messages/MessageActionBar.tsx b/src/components/views/messages/MessageActionBar.tsx
index 1831e2da12..2b0faa210a 100644
--- a/src/components/views/messages/MessageActionBar.tsx
+++ b/src/components/views/messages/MessageActionBar.tsx
@@ -42,6 +42,7 @@ import { RoomPermalinkCreator } from '../../../utils/permalinks/Permalinks';
 import ReplyChain from '../elements/ReplyChain';
 import { dispatchShowThreadEvent } from '../../../dispatcher/dispatch-actions/threads';
 import ReactionPicker from "../emojipicker/ReactionPicker";
+import { MsgType } from 'matrix-js-sdk/src/@types/event';
 
 interface IOptionsButtonProps {
     mxEvent: MatrixEvent;
@@ -210,6 +211,21 @@ export default class MessageActionBar extends React.PureComponent<IMessageAction
         });
     };
 
+    private readonly forbiddenThreadHeadMsgType = [
+        MsgType.KeyVerificationRequest,
+    ];
+
+    private get showReplyInThreadAction(): boolean {
+        const isThreadEnabled = SettingsStore.getValue("feature_thread");
+        const inNotThreadTimeline = this.context.timelineRenderingType !== TimelineRenderingType.Thread;
+
+        const isAllowedMessageType = !this.forbiddenThreadHeadMsgType.includes(
+            this.props.mxEvent.getContent().msgtype as MsgType,
+        );
+
+        return isThreadEnabled && inNotThreadTimeline && isAllowedMessageType;
+    }
+
     /**
      * Runs a given fn on the set of possible events to test. The first event
      * that passes the checkFn will have fn executed on it. Both functions take
@@ -294,8 +310,7 @@ export default class MessageActionBar extends React.PureComponent<IMessageAction
                             onClick={this.onReplyClick}
                             key="reply"
                         />
-                        { (SettingsStore.getValue("feature_thread")
-                            && this.context.timelineRenderingType !== TimelineRenderingType.Thread) && (
+                        { (this.showReplyInThreadAction) && (
                             <RovingAccessibleTooltipButton
                                 className="mx_MessageActionBar_maskButton mx_MessageActionBar_threadButton"
                                 title={_t("Reply in thread")}
diff --git a/src/components/views/rooms/EventTile.tsx b/src/components/views/rooms/EventTile.tsx
index 0ed29d18b6..e2e6ecc2da 100644
--- a/src/components/views/rooms/EventTile.tsx
+++ b/src/components/views/rooms/EventTile.tsx
@@ -17,7 +17,7 @@ limitations under the License.
 
 import React, { createRef } from 'react';
 import classNames from "classnames";
-import { EventType } from "matrix-js-sdk/src/@types/event";
+import { EventType, MsgType } from "matrix-js-sdk/src/@types/event";
 import { EventStatus, MatrixEvent } from "matrix-js-sdk/src/models/event";
 import { Relations } from "matrix-js-sdk/src/models/relations";
 import { RoomMember } from "matrix-js-sdk/src/models/room-member";
@@ -130,7 +130,7 @@ export function getHandlerTile(ev) {
     // not even when showing hidden events
     if (type === "m.room.message") {
         const content = ev.getContent();
-        if (content && content.msgtype === "m.key.verification.request") {
+        if (content && content.msgtype === MsgType.KeyVerificationRequest) {
             const client = MatrixClientPeg.get();
             const me = client && client.getUserId();
             if (ev.getSender() !== me && content.to !== me) {