diff --git a/htdocs/opensurvey/card.php b/htdocs/opensurvey/card.php
index ca43feb70a2..474d7db85f4 100644
--- a/htdocs/opensurvey/card.php
+++ b/htdocs/opensurvey/card.php
@@ -142,8 +142,7 @@ if ($idcomment)
 	// Security check
 	if (!$user->rights->opensurvey->write) accessforbidden();
 	
-	$sql = 'DELETE FROM '.MAIN_DB_PREFIX.'opensurvey_comments WHERE id_comment = '.$idcomment;
-	$resql = $db->query($sql);
+	$resql = $object->deleteComment($idcomment);
 }
 
 if ($action == 'edit') {
diff --git a/htdocs/opensurvey/class/opensurveysondage.class.php b/htdocs/opensurvey/class/opensurveysondage.class.php
index 5d532fead5b..45c58688969 100644
--- a/htdocs/opensurvey/class/opensurveysondage.class.php
+++ b/htdocs/opensurvey/class/opensurveysondage.class.php
@@ -478,6 +478,23 @@ class Opensurveysondage extends CommonObject
 		return true;
 	}
 	
+	/**
+	 * Deletes a comment of the poll
+	 * 
+	 * @param int $id_comment Id of the comment
+	 * @return boolean False in case of the query fails, true if it was successful
+	 */
+	public function deleteComment($id_comment) {
+		$sql = 'DELETE FROM '.MAIN_DB_PREFIX.'opensurvey_comments WHERE id_comment = '.$id_comment.' AND id_sondage = '.$this->id_sondage;
+		$resql = $this->db->query($sql);
+		
+		if (!$resql) {
+			return false;
+		}
+		
+		return true;
+	}
+	
 	/**
 	 * Cleans all the class variables before doing an update or an insert
 	 * 
diff --git a/htdocs/opensurvey/public/studs.php b/htdocs/opensurvey/public/studs.php
index a8274ddeb79..6042aafd37b 100644
--- a/htdocs/opensurvey/public/studs.php
+++ b/htdocs/opensurvey/public/studs.php
@@ -205,8 +205,7 @@ if ($testmodifier)
 $idcomment=GETPOST('deletecomment','int');
 if ($idcomment)
 {
-	$sql = 'DELETE FROM '.MAIN_DB_PREFIX.'opensurvey_comments WHERE id_comment = '.$idcomment;
-	$resql = $db->query($sql);
+	$resql = $object->deleteComment($idcomment);
 }