diff --git a/nmap.cc b/nmap.cc
index 7084bde46..06fbe9ff2 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -1638,7 +1638,7 @@ int nmap_main(int argc, char *argv[]) {
   xml_attribute("start", "%lu", (unsigned long) timep);
   xml_attribute("startstr", "%s", mytime);
   xml_attribute("version", "%s", NMAP_VERSION);
-  xml_attribute("xmloutputversion", "1.04");
+  xml_attribute("xmloutputversion", NMAP_XMLOUTPUTVERSION);
   xml_close_start_tag();
   xml_newline();
 
diff --git a/nmap.h b/nmap.h
index 22e6b4c65..a1655c33c 100644
--- a/nmap.h
+++ b/nmap.h
@@ -239,6 +239,8 @@ void *realloc();
    earlier) than NMAP_VERSION. */
 #define NMAP_UPDATE_CHANNEL "5.61TEST4"
 
+#define NMAP_XMLOUTPUTVERSION "1.04"
+
 /* User configurable #defines: */
 #define MAX_PROBE_PORTS 10     /* How many TCP probe ports are allowed ? */
 /* Default number of ports in parallel.  Doesn't always involve actual