diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 066833c48..c8a9a2bc4 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -6,6 +6,7 @@
 - **Form Validation** - Bracketed notation can now be omitted for rules, instead passing in bracketed values with the `value` parameter #3313
 
 **Bugs**
+- **Button** - Fixed `vertical buttons` with only 1 button having incorrect border radius **Thanks @Denhai** #4107
 - **Form** - Fixed issue where `disabled fields` with radio inputs would not correctly dim the label **Thanks @louwers** #4366
 - **Menu** - Fixed issue where `dropdown` in `vertical menu` would not correctly open `upward` when no space below **Thanks @gdaunton** #4150 #4156
 - **Dropdown** - Fixed issue where dropdown `clear` would not remove active state when `useLabels: true` and multiple dropdown #4275 #4366 **Thanks vinh123456789**
diff --git a/src/definitions/elements/button.less b/src/definitions/elements/button.less
index d9b8e28c4..d801cc6cd 100755
--- a/src/definitions/elements/button.less
+++ b/src/definitions/elements/button.less
@@ -3427,6 +3427,9 @@
   margin-bottom: 0px;
   border-radius: 0px 0px @borderRadius @borderRadius;
 }
+.ui.vertical.buttons .button:only-child {
+  border-radius: @borderRadius;
+}
 
 .loadUIOverrides();