diff --git a/lib/loofah/html5/scrub.rb b/lib/loofah/html5/scrub.rb
index d9f55707..5dbfb87e 100644
--- a/lib/loofah/html5/scrub.rb
+++ b/lib/loofah/html5/scrub.rb
@@ -6,7 +6,7 @@ module Loofah
   module HTML5 # :nodoc:
     module Scrub
       CONTROL_CHARACTERS = /[`\u0000-\u0020\u007f\u0080-\u0101]/
-      CSS_KEYWORDISH = /\A(#[0-9a-fA-F]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|-?\d{0,3}\.?\d{0,10}(ch|cm|r?em|ex|in|mm|pc|pt|px|Q|vw|vh|%|,|\))?)\z/
+      CSS_KEYWORDISH = /\A(#[0-9a-fA-F]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|-?\d{0,3}\.?\d{0,10}(ch|cm|r?em|ex|in|lh|mm|pc|pt|px|Q|vw|vh|%|,|\))?)\z/
       CRASS_SEMICOLON = { :node => :semicolon, :raw => ";" }
 
       class << self
diff --git a/test/html5/test_sanitizer.rb b/test/html5/test_sanitizer.rb
index 60f04a4f..8d6f97d6 100755
--- a/test/html5/test_sanitizer.rb
+++ b/test/html5/test_sanitizer.rb
@@ -323,6 +323,12 @@ def test_css_Q_value
     assert_match %r/10Q/, sane.inner_html
   end
 
+  def test_css_lh_value
+    html = "<p style=\"line-height: 2lh;\"></body>"
+    sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :escape).to_xml)
+    assert_match %r/2lh/, sane.inner_html
+  end
+
   def test_css_function_sanitization_leaves_safelisted_functions_calc
     html = "<span style=\"width:calc(5%)\">"
     sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)