diff --git a/system/database/drivers/interbase/interbase_forge.php b/system/database/drivers/interbase/interbase_forge.php
index 166f387..4e6a60c 100644
--- a/system/database/drivers/interbase/interbase_forge.php
+++ b/system/database/drivers/interbase/interbase_forge.php
@@ -135,7 +135,7 @@
 
 		if (count($primary_keys) > 0)
 		{
-			$primary_keys = $this->db->escape_identifiers($primary_keys);
+			$primary_keys = $this->db->protect_identifiers($primary_keys);
 			$sql .= ",\n\tPRIMARY KEY (".implode(', ', $primary_keys).')';
 		}
 
@@ -144,7 +144,7 @@
 			foreach ($keys as $key)
 			{
 				$key = is_array($key)
-					? $this->db->escape_identifiers($key)
+					? $this->db->protect_identifiers($key)
 					: array($this->db->escape_identifiers($key));
 
 				$sql .= ",\n\tUNIQUE (".implode(', ', $key).')';