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-rw-r--r--railties/html/500.html2
1 files changed, 2 insertions, 0 deletions
diff --git a/railties/html/500.html b/railties/html/500.html
index ee0c919c4a..a1001a008d 100644
--- a/railties/html/500.html
+++ b/railties/html/500.html
@@ -1,3 +1,5 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body>
<h1>Application error (Apache)</h1>