diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 1578c4cab..ef0abdcda 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -31,6 +31,7 @@
 - **Modal** - Fix autofocus setting in modal not working due to improper selector #2737
 - **Modal** - Increased `close` specificity, modal will now only close on `> .close` #2736
 - **Transition** - Transition callbacks now all have the correct `this` set. #2758
+- **Dropdown** - Fix `left menu` inside `ui menu` appearing horizontally #2778
 
 **Additional Bugs**
 - **Build Tools** - Fixes issue on `win` platform where packaged theme would not correctly update when using watch due to regExp not matching windows path separators.
diff --git a/src/definitions/collections/menu.less b/src/definitions/collections/menu.less
index d990d5823..271efba9e 100755
--- a/src/definitions/collections/menu.less
+++ b/src/definitions/collections/menu.less
@@ -229,6 +229,7 @@
   background: @dropdownBackground;
   margin: @dropdownMenuDistance 0px 0px;
   box-shadow: @dropdownMenuBoxShadow;
+  flex-direction: column !important;
 }