diff --git a/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf b/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf
index 7cec0ddde..559a38772 100644
--- a/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf
+++ b/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf
@@ -885,7 +885,7 @@ SecRule &TX:COMBINED_FILE_SIZES "@eq 1" \
 # - text/plain; charset="UTF-8"
 # - multipart/form-data; boundary=----WebKitFormBoundary12345
 #
-SecRule REQUEST_HEADERS:Content-Type "!@rx ^[\w/.+-]+(?:\s?;\s?(?:boundary|charset)\s?=\s?['\"\w.()+,/:=?-]+)?$" \
+SecRule REQUEST_HEADERS:Content-Type "!@rx ^[\w/.+-]+(?:\s?;\s?(?:boundary|charset|action)\s?=\s?['\"\w.()+,/:=?#-]+){0,3}$" \
     "id:920470,\
     phase:1,\
     block,\