diff --git a/mbuni/mmlib/mms_mm7soap.c b/mbuni/mmlib/mms_mm7soap.c
index 8bbcfe1..bb02aa6 100644
--- a/mbuni/mmlib/mms_mm7soap.c
+++ b/mbuni/mmlib/mms_mm7soap.c
@@ -433,7 +433,7 @@ static Octstr *headers_to_soapxml(List *hdrs, MM7Version_t *ver)
      time_t t;
      char *prefix = ver->use_mm7_namespace ? "mm7:" : "";
      char *xml_nsp = ver->use_mm7_namespace ? ":mm7" : "";
-     MM7Version_t min_ver = {5,1,0}; /* minimum version we deal with. */
+     MM7Version_t min_ver = {5,3,0}; /* minimum version we deal with. */
      
      octstr_append_cstr(s, 
 		   "<" SOAP_ENV ":Envelope xmlns:" SOAP_ENV "=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"