diff --git a/core/install.php b/core/install.php
index 74bb3e72..c86cec6e 100644
--- a/core/install.php
+++ b/core/install.php
@@ -255,7 +255,7 @@ function create_tables(Database $db)
 			width INTEGER NOT NULL,
 			height INTEGER NOT NULL,
 			posted TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-			locked SCORE_BOOL NOT NULL DEFAULT SCORE_BOOL_N,
+			locked BOOLEAN NOT NULL DEFAULT FALSE,
 			FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE RESTRICT
 		");
         $db->execute("CREATE INDEX images_owner_id_idx ON images(owner_id)", []);
diff --git a/ext/upgrade/main.php b/ext/upgrade/main.php
index bfdf8f3d..0afcca24 100644
--- a/ext/upgrade/main.php
+++ b/ext/upgrade/main.php
@@ -32,9 +32,9 @@ class Upgrade extends Extension
         // now done again as v9 with PDO
 
         if ($this->get_version("db_version") < 8) {
-            $database->execute($database->scoreql_to_sql(
-                "ALTER TABLE images ADD COLUMN locked SCORE_BOOL NOT NULL DEFAULT SCORE_BOOL_N"
-            ));
+            $database->execute(
+                "ALTER TABLE images ADD COLUMN locked BOOLEAN NOT NULL DEFAULT FALSE"
+            );
 
             $this->set_version("db_version", 8);
         }
@@ -197,6 +197,11 @@ class Upgrade extends Extension
 
             $this->set_version("db_version", 19);
         }
+
+        if ($this->get_version("db_version") < 20) {
+            $database->standardise_boolean("images", "locked");
+            $this->set_version("db_version", 20);
+        }
     }
 
     public function get_priority(): int