diff --git a/readme.txt b/readme.txt
index b2e41bd..236291a 100644
--- a/readme.txt
+++ b/readme.txt
@@ -3,7 +3,7 @@ Contributors: cadeyrn
 Tags: cache, APC, memcached, full page cache
 Requires at least: 3.0
 Tested up to: 3.3.1
-Stable tag: 0.2
+Stable tag: 0.2.1
 
 Fast Full Page Cache, backend can be memcached or APC
 
@@ -46,6 +46,12 @@ Some parts were based on [Hyper Cache](http://wordpress.org/extend/plugins/hyper
 
 == Changelog ==
 
+= 0.2.1 =
+2012.02.21
+
+* bugfix, duplicated inclusion could emerge, fix added, thanks for Géza Kuti for reporting!
+
+
 = 0.2 =
 2012.02.19
 
diff --git a/wp-ffpc-common.php b/wp-ffpc-common.php
index 3ff4e38..494f989 100644
--- a/wp-ffpc-common.php
+++ b/wp-ffpc-common.php
@@ -9,6 +9,10 @@
 global $wp_ffpc_backend;
 global $wp_nmc_redirect;
 
+/* safety rules if file has been already included */
+if ( function_exists('wp_ffpc_init') || function_exists('wp_ffpc_clear') || function_exists('wp_ffpc_set') || function_exists('wp_ffpc_get') )
+	return false;
+
 /**
  * init and backend alive check function
  *
diff --git a/wp-ffpc.php b/wp-ffpc.php
index 67ab0a2..eefeef5 100644
--- a/wp-ffpc.php
+++ b/wp-ffpc.php
@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: WP-FFPC
-Version: 0.2
+Version: 0.2.1
 Plugin URI: http://petermolnar.eu/wordpress/wp-ffpc
 Description: Fast Full Page Cache, backend can be memcached or APC
 Author: Peter Molnar
@@ -44,7 +44,7 @@ define ( 'WP_FFPC_ACACHE_INC_FILE' , WP_FFPC_DIR. '/advanced-cache.php' );
 define ( 'WP_FFPC_ACACHE_COMMON_FILE' , WP_FFPC_DIR. '/wp-ffpc-common.php' );
 define ( 'WP_FFPC_CONFIG_VAR' , '$wp_ffpc_config' );
 
-include (WP_FFPC_DIR .'/wp-ffpc-common.php');
+include_once (WP_FFPC_DIR .'/wp-ffpc-common.php');
 
 if (!class_exists('WPFFPC')) {