diff --git a/Mkfiles/dj/config.h b/Mkfiles/dj/config.h
index 94a7a80..3898b24 100644
--- a/Mkfiles/dj/config.h
+++ b/Mkfiles/dj/config.h
@@ -120,22 +120,22 @@
 #define PACKAGE_BUGREPORT "bug-yasm@tortall.net"
 
 /* Define to build version of this package. */
-#define PACKAGE_BUILD "BRANCH"
+#define PACKAGE_BUILD "1591"
 
 /* Define to internal version of this package. */
-#define PACKAGE_INTVER "0.5.1"
+#define PACKAGE_INTVER "0.5.0"
 
 /* Define to the full name of this package. */
 #define PACKAGE_NAME "yasm"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "yasm 0.5.x"
+#define PACKAGE_STRING "yasm 0.5.0"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "yasm"
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "0.5.x"
+#define PACKAGE_VERSION "0.5.0"
 
 /* Define if the C compiler supports function prototypes. */
 #define PROTOTYPES 1
diff --git a/Mkfiles/vc/config.h b/Mkfiles/vc/config.h
index 8ca63df..15f51dd 100644
--- a/Mkfiles/vc/config.h
+++ b/Mkfiles/vc/config.h
@@ -121,22 +121,22 @@
 #define PACKAGE_BUGREPORT "bug-yasm@tortall.net"
 
 /* Define to build version of this package. */
-#define PACKAGE_BUILD "BRANCH"
+#define PACKAGE_BUILD "1591"
 
 /* Define to internal version of this package. */
-#define PACKAGE_INTVER "0.5.1"
+#define PACKAGE_INTVER "0.5.0"
 
 /* Define to the full name of this package. */
 #define PACKAGE_NAME "yasm"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "yasm 0.5.x"
+#define PACKAGE_STRING "yasm 0.5.0"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "yasm"
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "0.5.x"
+#define PACKAGE_VERSION "0.5.0"
 
 /* Define if the C compiler supports function prototypes. */
 #define PROTOTYPES 1
diff --git a/Mkfiles/vc8/config.h b/Mkfiles/vc8/config.h
index 198f885..1c7e51d 100644
--- a/Mkfiles/vc8/config.h
+++ b/Mkfiles/vc8/config.h
@@ -123,22 +123,22 @@
 #define PACKAGE_BUGREPORT "bug-yasm@tortall.net"
 
 /* Define to build version of this package. */
-#define PACKAGE_BUILD "BRANCH"
+#define PACKAGE_BUILD "1591"
 
 /* Define to internal version of this package. */
-#define PACKAGE_INTVER "0.5.1"
+#define PACKAGE_INTVER "0.5.0"
 
 /* Define to the full name of this package. */
 #define PACKAGE_NAME "yasm"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "yasm 0.5.x"
+#define PACKAGE_STRING "yasm 0.5.0"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "yasm"
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "0.5.x"
+#define PACKAGE_VERSION "0.5.0"
 
 /* Define if the C compiler supports function prototypes. */
 #define PROTOTYPES 1
diff --git a/configure.ac b/configure.ac
index 12dab43..462ece4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,12 +10,12 @@
 AC_CONFIG_AUX_DIR(config)
 AM_CONFIG_HEADER([config.h])
 
-AM_INIT_AUTOMAKE(yasm, [0.5.x])
+AM_INIT_AUTOMAKE(yasm, [0.5.0])
 AM_MAINTAINER_MODE
 
-AC_DEFINE(PACKAGE_INTVER, ["0.5.1"],
+AC_DEFINE(PACKAGE_INTVER, ["0.5.0"],
 	  [Define to internal version of this package.])
-AC_DEFINE(PACKAGE_BUILD, ["BRANCH"], [Define to build version of this package.])
+AC_DEFINE(PACKAGE_BUILD, ["1591"], [Define to build version of this package.])
 
 #
 # autoconf command-line options