diff --git a/resources/skins.vector.styles/common/typography.less b/resources/skins.vector.styles/common/typography.less
index b518038..75b99df 100644
--- a/resources/skins.vector.styles/common/typography.less
+++ b/resources/skins.vector.styles/common/typography.less
@@ -79,7 +79,7 @@ pre,
 	font-size: @font-size-base;
 	// Support IE 9-11, Trident cuts values 2 digits after decimal point.
 	// `calc` enables to set correct calculation in place again. See T102364.
-	font-size: calc( 1em ~'*' unit( @font-size-base ) );
+	font-size: @font-size-base--trident-hack;
 	line-height: @line-height-base;
 
 	h1 {
diff --git a/variables.less b/variables.less
index a8ec1e2..d6dc81a 100644
--- a/variables.less
+++ b/variables.less
@@ -40,6 +40,7 @@
 @font-family-sans--fallback: sans-serif;
 
 @font-size-base: unit( 14 / @font-size-browser, em ); // Equals `0.875em`.
+@font-size-base--trident-hack: calc( 1em ~'*' unit( @font-size-base ) );
 @font-size-reset: @font-size-root;
 @font-size-heading-1: 1.8em;
 @font-size-heading-2: 1.5em;