diff --git a/info.php b/info.php
index 19a570e7..05b2574d 100644
--- a/info.php
+++ b/info.php
@@ -42,7 +42,7 @@ include ("functions/functions.xhtml.php");
 /**
  * Language
  */
-include ("lang.inc.php");
+include_once ("lang.inc.php");
 
 /**
  * Database
diff --git a/project_info.php b/project_info.php
index 3c5f812c..c9b04fa7 100644
--- a/project_info.php
+++ b/project_info.php
@@ -42,7 +42,7 @@ include ("functions/functions.xhtml.php");
 /**
  * Language
  */
-include ("lang.inc.php");
+include_once ("lang.inc.php");
 
 /**
  * Database
diff --git a/rs_business.php b/rs_business.php
index 2c778bc1..5dc0a140 100644
--- a/rs_business.php
+++ b/rs_business.php
@@ -48,7 +48,7 @@ include ("functions/functions.xhtml.php");
 /**
  * Language
  */
-include ("lang.inc.php");
+include_once ("lang.inc.php");
 
 $js = array("js/popup.js","include/jquery/jquery-1.4.2.min.js","include/jquery-ui/jquery-ui.min.js");
 
diff --git a/rs_business_interface2.php b/rs_business_interface2.php
index 7a4decb7..e4cc4607 100644
--- a/rs_business_interface2.php
+++ b/rs_business_interface2.php
@@ -48,7 +48,7 @@ include ("functions/functions.xhtml.php");
 /**
  * Language
  */
-include ("lang.inc.php");
+include_once ("lang.inc.php");
 
 $js = array("js/popup.js","include/jquery/jquery-1.4.2.min.js","include/jquery-ui/jquery-ui.min.js");