diff --git a/config.m4 b/config.m4
index f214922..6b04014 100644
--- a/config.m4
+++ b/config.m4
@@ -93,16 +93,20 @@ if test "${K2H_HAVE_PHP_BINARY}" = "yes"; then
 	AC_SUBST([K2H_PHP_MAJOR_VERSION], [$(php -r 'echo "".PHP_MAJOR_VERSION."";')])
 	AC_SUBST([K2H_PHP_MINOR_VERSION], [$(php -r 'echo "".PHP_MINOR_VERSION."";')])
 	AC_SUBST([K2H_EXT_PKGNAME],       [$(head -n 1 $(pwd)/ChangeLog | awk '{print $1}')])
-	AC_SUBST([K2H_EXT_VERSION],       [$(head -n 1 $(pwd)/ChangeLog | sed -e 's/[(]//g' -e 's/[)]//g' | awk '{print $2}' | sed -e 's/-.*$//g')])
 	AC_SUBST([K2H_EXT_RELEASE],       [$(head -n 1 $(pwd)/ChangeLog | sed -e 's/[(]//g' -e 's/[)]//g' | awk '{print $2}' | sed -e 's/^.*-//g')])
+	AC_SUBST([K2H_EXT_VERSION],       [$(head -n 1 $(pwd)/ChangeLog | sed -e 's/[(]//g' -e 's/[)]//g' | awk '{print $2}' | sed -e 's/-.*$//g')])
+
+	AC_DEFINE_UNQUOTED(PHP_K2HASH_VERSION, ["$(head -n 1 $(pwd)/ChangeLog | sed -e 's/[(]//g' -e 's/[)]//g' | awk '{print $2}' | sed -e 's/-.*$//g')"], [ PHP Extension version ])
 else
 	AC_SUBST([K2H_PHP_VERSION],       "0.0")
 	AC_SUBST([K2H_PHP_RAW_VERSION],   "00")
 	AC_SUBST([K2H_PHP_MAJOR_VERSION], "0")
 	AC_SUBST([K2H_PHP_MINOR_VERSION], "0")
 	AC_SUBST([K2H_EXT_PKGNAME],       "php-pecl-k2hash")
-	AC_SUBST([K2H_EXT_VERSION],       "0.0.0")
 	AC_SUBST([K2H_EXT_RELEASE],       "0")
+	AC_SUBST([K2H_EXT_VERSION],       "0.0.0")
+
+	AC_DEFINE(PHP_K2HASH_VERSION,     "0.0.0", [ PHP Extension version ])
 fi
 
 #
diff --git a/php_k2hash.h b/php_k2hash.h
index 4b82553..cca9292 100644
--- a/php_k2hash.h
+++ b/php_k2hash.h
@@ -23,11 +23,9 @@
 
 #include <k2hash.h>
 #include <fcntl.h>
+#include "config.h"
 
 extern zend_module_entry k2hash_module_entry;
-# define k2hash_ptr &k2hash_module_entry
-
-# define PHP_K2HASH_VERSION "1.1.3"
 
 /* {{{ k2hash object */
 typedef struct php_k2hash_object_ {