diff --git a/classes/ImportModule.php b/classes/ImportModule.php
index 7b7223933..5e6295e9e 100644
--- a/classes/ImportModule.php
+++ b/classes/ImportModule.php
@@ -81,7 +81,7 @@ abstract class ImportModuleCore extends Module
 	{
 		$modules = Module::getModulesOnDisk(true);
 		foreach ($modules as $key => $module)
-			if (get_parent_class($module) != 'ImportModule')
+			if (!isset($module->parent_class) || $module->parent_class != 'ImportModule')
 				unset($modules[$key]);
 		return $modules;
 	}
diff --git a/classes/Module.php b/classes/Module.php
index 9f82126e4..e3958dcc3 100644
--- a/classes/Module.php
+++ b/classes/Module.php
@@ -1020,7 +1020,8 @@ abstract class ModuleCore
 					$item->description = $tmp_module->description;
 					$item->author = $tmp_module->author;
 					$item->limited_countries = $tmp_module->limited_countries;
-					$item->is_configurable = isset($tmp_module->is_configurable) ? $tmp_module->is_configurable : 1;
+					$item->parent_class = get_parent_class($module);
+					$item->is_configurable = method_exists($tmp_module, 'getContent') ? 1 : 0;
 					$item->need_instance = isset($tmp_module->need_instance) ? $tmp_module->need_instance : 0;
 					$item->active = $tmp_module->active;
 					$item->currencies = isset($tmp_module->currencies) ? $tmp_module->currencies : null;
@@ -1095,6 +1096,7 @@ abstract class ModuleCore
 							$item->description = strip_tags((string)$modaddons->description);
 							$item->author = strip_tags((string)$modaddons->author);
 							$item->limited_countries = array();
+							$item->parent_class = '';
 							$item->is_configurable = 0;
 							$item->need_instance = 0;
 							$item->not_on_disk = 1;
@@ -1540,7 +1542,7 @@ abstract class ModuleCore
 	<description><![CDATA['.Tools::htmlentitiesUTF8($this->description).']]></description>
 	<author><![CDATA['.Tools::htmlentitiesUTF8($this->author).']]></author>
 	<tab><![CDATA['.Tools::htmlentitiesUTF8($this->tab).']]></tab>'.(isset($this->confirmUninstall) ? "\n\t".'<confirmUninstall>'.$this->confirmUninstall.'</confirmUninstall>' : '').'
-	<is_configurable>'.(int)method_exists($this, 'getContent').'</is_configurable>
+	<is_configurable>'.(int)$this->is_configurable.'</is_configurable>
 	<need_instance>'.(int)$this->need_instance.'</need_instance>'.(isset($this->limited_countries) ? "\n\t".'<limited_countries>'.(count($this->limited_countries) == 1 ? $this->limited_countries[0] : '').'</limited_countries>' : '').'
 </module>';
 		if (is_writable(_PS_MODULE_DIR_.$this->name.'/'))
diff --git a/controllers/admin/AdminModulesController.php b/controllers/admin/AdminModulesController.php
index 0a3ae3a4e..2e60e84b5 100644
--- a/controllers/admin/AdminModulesController.php
+++ b/controllers/admin/AdminModulesController.php
@@ -815,7 +815,7 @@ class AdminModulesControllerCore extends AdminController
 		if ($module->id && $module->active)
 			$return .= (!empty($result) ? '|' : '').' <span class="reset-module"><a class="action_module" '.(method_exists($module, 'onclickOption')? 'onclick="'.$module->onclickOption('reset', $href).'"' : '').' href="'.self::$currentIndex.'&token='.$this->token.'&module_name='.urlencode($module->name).'&reset&tab_module='.$module->tab.'">'.$this->translationsTab['Reset'].'</a></span>';
 
-		if ($module->id && (method_exists($module, 'getContent') || (isset($module->is_configurable) && $module->is_configurable)))
+		if ($module->id && isset($module->is_configurable) && $module->is_configurable)
 			$return .= (!empty($result) ? '|' : '').' <span class="configure-module"><a class="action_module" '.(method_exists($module, 'onclickOption')? 'onclick="'.$module->onclickOption('configure', $href).'"' : '').' href="'.self::$currentIndex.'&configure='.urlencode($module->name).'&token='.$this->token.'&tab_module='.$module->tab.'&module_name='.urlencode($module->name).'">'.$this->translationsTab['Configure'].'</a></span>';
 
 		$hrefDelete = self::$currentIndex.'&delete='.urlencode($module->name).'&token='.$this->token.'&tab_module='.$module->tab.'&module_name='.urlencode($module->name);
diff --git a/modules/gsitemap/config.xml b/modules/gsitemap/config.xml
index 33f7a8401..a3ecba150 100755
--- a/modules/gsitemap/config.xml
+++ b/modules/gsitemap/config.xml
@@ -6,7 +6,7 @@
 	<description><![CDATA[Generate your Google sitemap file]]></description>
 	<author><![CDATA[PrestaShop]]></author>
 	<tab><![CDATA[seo]]></tab>
-	<is_configurable>1</is_configurable>
+	<is_configurable>0</is_configurable>
 	<need_instance>0</need_instance>
 	<limited_countries></limited_countries>
 </module>
\ No newline at end of file