diff --git a/adminer/drivers/mysql.inc.php b/adminer/drivers/mysql.inc.php
index 0f030204..fe8d17b7 100644
--- a/adminer/drivers/mysql.inc.php
+++ b/adminer/drivers/mysql.inc.php
@@ -457,8 +457,8 @@ if (!defined("DRIVER")) {
 					"table" => idf_unescape($match[4] != "" ? $match[4] : $match[3]),
 					"source" => array_map('idf_unescape', $source[0]),
 					"target" => array_map('idf_unescape', $target[0]),
-					"on_delete" => $match[6],
-					"on_update" => $match[7],
+					"on_delete" => ($match[6] ? $match[6] : "RESTRICT"),
+					"on_update" => ($match[7] ? $match[7] : "RESTRICT"),
 				);
 			}
 		}
diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 71057e5c..dfbd5d22 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -287,8 +287,8 @@ ORDER BY conkey, conname") as $row) {
 					$row['table'] = $match2[2];
 				}
 				$row['target'] = array_map('trim', explode(',', $match[3]));
-				$row['on_delete'] = (preg_match("~ON DELETE ($on_actions)~", $match[4], $match2) ? $match2[1] : '');
-				$row['on_update'] = (preg_match("~ON UPDATE ($on_actions)~", $match[4], $match2) ? $match2[1] : '');
+				$row['on_delete'] = (preg_match("~ON DELETE ($on_actions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
+				$row['on_update'] = (preg_match("~ON UPDATE ($on_actions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
 				$return[$row['conname']] = $row;
 			}
 		}
diff --git a/changes.txt b/changes.txt
index 5e9eee52..28133307 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,4 +1,5 @@
 Adminer 3.3.4-dev:
+Foreign keys default actions (bug #3397606)
 PostgreSQL: fix alter foreign key
 PostgreSQL over PDO: connect if the eponymous database does not exist (bug #3391619)
 Boolean search (Editor)