diff --git a/source/css/_defines/fonts.styl b/source/css/_defines/fonts.styl
index 72270ef..49620a4 100644
--- a/source/css/_defines/fonts.styl
+++ b/source/css/_defines/fonts.styl
@@ -29,7 +29,7 @@ $fontsize-code = .8125rem  // 13px
 $fontsize-footnote = .75rem  // the smallest (12px)
 
 // line-height
-$lineheight = 1.4em
+$lineheight = 1.4
 
 $fontsize-large = 3rem
 $fontsize-huge = 4rem