diff --git a/changelog.d/profile-mentions.fix b/changelog.d/profile-mentions.fix
new file mode 100644
index 00000000..3f38ab0c
--- /dev/null
+++ b/changelog.d/profile-mentions.fix
@@ -0,0 +1 @@
+Fix profile mentions causing a 422 error
diff --git a/src/components/post_status_form/post_status_form.js b/src/components/post_status_form/post_status_form.js
index 5564b118..563dfb96 100644
--- a/src/components/post_status_form/post_status_form.js
+++ b/src/components/post_status_form/post_status_form.js
@@ -87,7 +87,8 @@ const PostStatusForm = {
     'fileLimit',
     'submitOnEnter',
     'emojiPickerPlacement',
-    'optimisticPosting'
+    'optimisticPosting',
+    'profileMention'
   ],
   emits: [
     'posted',
@@ -125,7 +126,7 @@ const PostStatusForm = {
 
     const { scopeCopy } = this.$store.getters.mergedConfig
 
-    if (this.replyTo) {
+    if (this.replyTo || this.profileMention) {
       const currentUser = this.$store.state.users.currentUser
       statusText = buildMentionsString({ user: this.repliedUser, attentions: this.attentions }, currentUser)
     }
diff --git a/src/components/user_card/user_card.js b/src/components/user_card/user_card.js
index e17bf8eb..b1fe2e8f 100644
--- a/src/components/user_card/user_card.js
+++ b/src/components/user_card/user_card.js
@@ -225,7 +225,7 @@ export default {
       this.$store.dispatch('setCurrentMedia', attachment)
     },
     mentionUser () {
-      this.$store.dispatch('openPostStatusModal', { replyTo: true, repliedUser: this.user })
+      this.$store.dispatch('openPostStatusModal', { profileMention: true, repliedUser: this.user })
     },
     onAvatarClickHandler (e) {
       if (this.onAvatarClick) {