diff --git a/doc/base/classes.xml b/doc/base/classes.xml
index 7bf4150f3e9..35098d506d4 100644
--- a/doc/base/classes.xml
+++ b/doc/base/classes.xml
@@ -1103,7 +1103,7 @@
 			% key
 		</constant>
 		<constant name="KEY_AMPERSAND" value="38">
-			& key
+			&amp; key
 		</constant>
 		<constant name="KEY_APOSTROPHE" value="39">
 			' key