diff --git a/app/assets/stylesheets/framework/timeline.scss b/app/assets/stylesheets/framework/timeline.scss
index 3d5208c3db5..e8176e59c19 100644
--- a/app/assets/stylesheets/framework/timeline.scss
+++ b/app/assets/stylesheets/framework/timeline.scss
@@ -55,4 +55,5 @@
 .discussion .timeline-entry {
   margin: 0;
   border-right: 0;
+  border-radius: $border-radius-default $border-radius-default 0 0;
 }
diff --git a/app/assets/stylesheets/pages/notes.scss b/app/assets/stylesheets/pages/notes.scss
index f2b67a693c3..fcb57db590a 100644
--- a/app/assets/stylesheets/pages/notes.scss
+++ b/app/assets/stylesheets/pages/notes.scss
@@ -107,6 +107,7 @@ $note-form-margin-left: 72px;
 
     &.collapsed {
       color: $gl-text-color-secondary;
+      border-radius: 0 0 $border-radius-default $border-radius-default;
 
       svg {
         float: left;
diff --git a/changelogs/unreleased/58538-discussion-top-radius.yml b/changelogs/unreleased/58538-discussion-top-radius.yml
new file mode 100644
index 00000000000..0fb16055623
--- /dev/null
+++ b/changelogs/unreleased/58538-discussion-top-radius.yml
@@ -0,0 +1,5 @@
+---
+title: Fix border radius of discussions
+merge_request: 28490
+author:
+type: fixed