diff --git a/modules/markdown-rule.pl b/modules/markdown-rule.pl
index 7e432b02..232d78f8 100644
--- a/modules/markdown-rule.pl
+++ b/modules/markdown-rule.pl
@@ -158,11 +158,11 @@ push(@MyRules, \&MarkdownExtraRule);
 sub MarkdownExtraRule {
   # __italic underline__
   if (m/\G__/cg) {
-    return AddOrCloseHtmlEnvironment('em', 'style="font-style: italic; text-decoration: underline"');
+    return AddOrCloseHtmlEnvironment('em', 'style="font-style: normal; text-decoration: underline"');
   }
   # _underline_
   elsif (m/\G_/cg) {
-    return AddOrCloseHtmlEnvironment('em', 'style="font-style: normal; text-decoration: underline";');
+    return AddOrCloseHtmlEnvironment('em', 'style="font-style: normal; text-decoration: underline"');
   }
   # //italic//
   elsif (m/\G\/\//cg) {
diff --git a/t/markdown-rule.t b/t/markdown-rule.t
index 76f6686c..2494487f 100644
--- a/t/markdown-rule.t
+++ b/t/markdown-rule.t
@@ -44,6 +44,10 @@ this is <strong>bold</strong>
 <strong>bold</strong>
 *italic*
 <em>italic</em>
+__underline__
+<em style="font-style: normal; text-decoration: underline">underline</em>
+_underline_
+<em style="font-style: normal; text-decoration: underline">underline</em>
 foo\nbar
 foo bar
 foo\n===\nbar