diff --git a/resources/src/mediawiki.less/mediawiki.ui/variables.less b/resources/src/mediawiki.less/mediawiki.ui/variables.less
index d61a22814f7..c9bc1524b7b 100644
--- a/resources/src/mediawiki.less/mediawiki.ui/variables.less
+++ b/resources/src/mediawiki.less/mediawiki.ui/variables.less
@@ -91,6 +91,9 @@
 @colorShadow: @colorGray14;
 @colorPlaceholder: @colorGray10;
 
+// Border
+@border-base: @border-width-base @border-style-base @border-color-base;
+
 // Border colors
 @border-color-base: #a2a9b1;
 @borderColorInputBinaryChecked: @colorProgressive;