diff --git a/mozilla/content/html/content/src/nsHTMLAtomList.h b/mozilla/content/html/content/src/nsHTMLAtomList.h
index 33de03244af..1968847b39d 100644
--- a/mozilla/content/html/content/src/nsHTMLAtomList.h
+++ b/mozilla/content/html/content/src/nsHTMLAtomList.h
@@ -53,7 +53,7 @@ HTML_ATOM(a, "a")
 HTML_ATOM(abbr, "abbr")
 HTML_ATOM(above, "above")
 HTML_ATOM(accept, "accept")
-HTML_ATOM(acceptcharset, "acceptcharset")
+HTML_ATOM(acceptcharset, "accept-charset")
 HTML_ATOM(accesskey, "accesskey")
 HTML_ATOM(action, "action")
 HTML_ATOM(align, "align")
diff --git a/mozilla/content/shared/public/nsHTMLAtomList.h b/mozilla/content/shared/public/nsHTMLAtomList.h
index 33de03244af..1968847b39d 100644
--- a/mozilla/content/shared/public/nsHTMLAtomList.h
+++ b/mozilla/content/shared/public/nsHTMLAtomList.h
@@ -53,7 +53,7 @@ HTML_ATOM(a, "a")
 HTML_ATOM(abbr, "abbr")
 HTML_ATOM(above, "above")
 HTML_ATOM(accept, "accept")
-HTML_ATOM(acceptcharset, "acceptcharset")
+HTML_ATOM(acceptcharset, "accept-charset")
 HTML_ATOM(accesskey, "accesskey")
 HTML_ATOM(action, "action")
 HTML_ATOM(align, "align")
diff --git a/mozilla/layout/html/base/src/nsHTMLAtomList.h b/mozilla/layout/html/base/src/nsHTMLAtomList.h
index 33de03244af..1968847b39d 100644
--- a/mozilla/layout/html/base/src/nsHTMLAtomList.h
+++ b/mozilla/layout/html/base/src/nsHTMLAtomList.h
@@ -53,7 +53,7 @@ HTML_ATOM(a, "a")
 HTML_ATOM(abbr, "abbr")
 HTML_ATOM(above, "above")
 HTML_ATOM(accept, "accept")
-HTML_ATOM(acceptcharset, "acceptcharset")
+HTML_ATOM(acceptcharset, "accept-charset")
 HTML_ATOM(accesskey, "accesskey")
 HTML_ATOM(action, "action")
 HTML_ATOM(align, "align")