diff --git a/mozilla/layout/html/document/src/html.css b/mozilla/layout/html/document/src/html.css
index e481c915157..0bac01167d1 100644
--- a/mozilla/layout/html/document/src/html.css
+++ b/mozilla/layout/html/document/src/html.css
@@ -105,7 +105,6 @@ h5 {
   display: block;
   font-size: 0.83em;
   font-weight: bold;
-  line-height: 1.17em;
   margin: 1.67em 0;
 }
 h6 {
diff --git a/mozilla/layout/style/html.css b/mozilla/layout/style/html.css
index e481c915157..0bac01167d1 100644
--- a/mozilla/layout/style/html.css
+++ b/mozilla/layout/style/html.css
@@ -105,7 +105,6 @@ h5 {
   display: block;
   font-size: 0.83em;
   font-weight: bold;
-  line-height: 1.17em;
   margin: 1.67em 0;
 }
 h6 {