diff --git a/htdocs/core/class/conf.class.php b/htdocs/core/class/conf.class.php
index 6937af8c3f7..c4ccd6fe982 100644
--- a/htdocs/core/class/conf.class.php
+++ b/htdocs/core/class/conf.class.php
@@ -485,7 +485,7 @@ class Conf
 
 		// Default pdf option
 		if (! isset($this->global->MAIN_PDF_DASH_BETWEEN_LINES)) $this->global->MAIN_PDF_DASH_BETWEEN_LINES=1;    // use dash between lines
-        if (! isset($this->global->PDF_ALLOW_HTML_FOR_FREE_TEXT)) $this->global->PDF_ALLOW_HTML_FOR_FREE_TEXT=1;  // allow html content into free footer text
+		if (! isset($this->global->PDF_ALLOW_HTML_FOR_FREE_TEXT)) $this->global->PDF_ALLOW_HTML_FOR_FREE_TEXT=1;  // allow html content into free footer text
 
 		// Set default value to MAIN_SHOW_LOGO
 		if (! isset($this->global->MAIN_SHOW_LOGO)) $this->global->MAIN_SHOW_LOGO=1;
@@ -505,6 +505,10 @@ class Conf
 		// Define list of limited modules (value must be key found for "name" property of module, so for example 'supplierproposal' for Module "Supplier Proposal"
 		if (! isset($this->global->MAIN_MODULES_FOR_EXTERNAL)) $this->global->MAIN_MODULES_FOR_EXTERNAL='user,societe,propal,commande,facture,categorie,supplierproposal,fournisseur,contact,projet,contrat,ficheinter,expedition,agenda,resource,adherent,blockedlog';	// '' means 'all'. Note that contact is added here as it should be a module later.
 
+		// Module part to include an external module into the MAIN_MODULES_FOR_EXTERNAL list 
+		if (! empty($this->modules_parts['moduleforexternal']))
+			foreach($this->modules_parts['moduleforexternal'] as $key=>$value) $this->global->MAIN_MODULES_FOR_EXTERNAL.=",$key";
+
 		// Enable select2
 		if (empty($this->global->MAIN_USE_JQUERY_MULTISELECT) || $this->global->MAIN_USE_JQUERY_MULTISELECT == '1') $this->global->MAIN_USE_JQUERY_MULTISELECT='select2';