diff --git a/docs/nmap.1 b/docs/nmap.1
index 4cd92efb2..da6a62ea1 100644
--- a/docs/nmap.1
+++ b/docs/nmap.1
@@ -102,7 +102,7 @@ This options summary is printed when Nmap is run with no arguments, and the late
 .sp
 .RS 4
 .nf
-Nmap 4\.51 ( http://insecure\.org )
+Nmap 4\.51BETA ( http://insecure\.org )
 Usage: nmap [Scan Type(s)] [Options] {target specification}
 TARGET SPECIFICATION:
   Can pass hostnames, IP addresses, networks, etc\.
diff --git a/docs/nmap.usage.txt b/docs/nmap.usage.txt
index f921f34b7..2a6d6e710 100644
--- a/docs/nmap.usage.txt
+++ b/docs/nmap.usage.txt
@@ -1,4 +1,4 @@
-Nmap 4.51 ( http://insecure.org )
+Nmap 4.51BETA ( http://insecure.org )
 Usage: nmap [Scan Type(s)] [Options] {target specification}
 TARGET SPECIFICATION:
   Can pass hostnames, IP addresses, networks, etc.
diff --git a/nmap.h b/nmap.h
index a4a49a672..19e2d4da4 100644
--- a/nmap.h
+++ b/nmap.h
@@ -253,7 +253,7 @@ void *realloc();
 #ifndef NMAP_VERSION
 /* Edit this definition only within the quotes, because it is read from this
    file by the makefiles. */
-#define NMAP_VERSION "4.51"
+#define NMAP_VERSION "4.51BETA"
 #define NMAP_NUM_VERSION "4.51.0.0"
 #endif