diff --git a/_config.yml b/_config.yml
index e856ea99a4..f5f83a7536 100644
--- a/_config.yml
+++ b/_config.yml
@@ -434,8 +434,6 @@ github_banner:
 # ---------------------------------------------------------------
 
 font:
-  # Use custom fonts families or not.
-  # Depended options: `external` and `family`.
   enable: false
 
   # Uri of fonts host, e.g. //fonts.googleapis.com (Default).
diff --git a/source/css/_variables/base.styl b/source/css/_variables/base.styl
index a2ed7933f2..915a825147 100644
--- a/source/css/_variables/base.styl
+++ b/source/css/_variables/base.styl
@@ -85,7 +85,7 @@ $font-weight-bolder       = 700;
 
 // Font size
 $font-size-base           = 1em;
-$font-size-base           = unit(hexo-config('font.global.size'), em) if hexo-config('font.global.size') is a 'unit';
+$font-size-base           = unit(hexo-config('font.global.size'), em) if hexo-config('font.enable') and hexo-config('font.global.size') is a 'unit';
 $font-size-smallest       = .75em;
 $font-size-smaller        = .8125em;
 $font-size-small          = .875em;
@@ -98,7 +98,7 @@ $font-size-largest        = 1.375em;
 // Headings font size
 $font-size-headings-step  = .125em;
 $font-size-headings-base  = 1.625em;
-$font-size-headings-base  = unit(hexo-config('font.headings.size'), em) if hexo-config('font.headings.size') is a 'unit';
+$font-size-headings-base  = unit(hexo-config('font.headings.size'), em) if hexo-config('font.enable') and hexo-config('font.headings.size') is a 'unit';
 
 
 // Global line height
@@ -199,7 +199,7 @@ $brand-hover-color              = white;
 $brand-bg                       = $black-deep;
 
 $font-size-title                = $font-size-largest;
-$font-size-title                = unit(hexo-config('font.title.size'), em) if hexo-config('font.title.size') is a 'unit';
+$font-size-title                = unit(hexo-config('font.title.size'), em) if hexo-config('font.enable') and hexo-config('font.title.size') is a 'unit';
 $font-size-subtitle             = $font-size-smaller;
 $subtitle-color                 = $grey-dark;
 $site-subtitle-color            = $grey-dark;