diff --git a/app/src/Command/DatabaseCommand.php b/app/src/Command/DatabaseCommand.php
index 54362b010..84eb84c20 100644
--- a/app/src/Command/DatabaseCommand.php
+++ b/app/src/Command/DatabaseCommand.php
@@ -91,7 +91,8 @@ public function execute(Arguments $args, ConsoleIo $io) {
 
         if($pSchemaConfig) {
           $io->out(__d('command', 'db.schema.plugin', [$p->plugin]));
-          $SchemaManager->applySchemaObject($pSchemaConfig);
+          $SchemaManager->applySchemaObject(schemaObject: $pSchemaConfig,
+                                            diffOnly: $args->getOption('not'));
         } else {
           $io->out(__d('command', 'db.schema.plugin.none', [$p->plugin]));
         }
diff --git a/app/src/Lib/Util/SchemaManager.php b/app/src/Lib/Util/SchemaManager.php
index 5fe8f60c6..7e6f3123b 100644
--- a/app/src/Lib/Util/SchemaManager.php
+++ b/app/src/Lib/Util/SchemaManager.php
@@ -122,17 +122,25 @@ public function applySchemaFile(
    * 
    * @since  COmanage Registry v5.0.0
    * @param  object $schemaObject Schema object
+   * @param  bool   $diffOnly     If true, generate a diff against the current database state, but do not apply it
    * @param  string $tablePrefix  String to prefix to table names
    */
 
-  public function applySchemaObject(object $schemaObject, string $tablePrefix="") {
+  public function applySchemaObject(
+    object $schemaObject,
+    bool   $diffOnly=false,
+    string $tablePrefix=""
+  ) {
     if(!$this->columnLibrary) {
       // We need the column library from the core config
-      $this->applySchemaFile(schemaFile: ROOT . DS . 'config' . DS . 'schema' . DS . 'schema.json',
-                             parseOnly: true);
+      $this->applySchemaFile(
+        schemaFile: ROOT . DS . 'config' . DS . 'schema' . DS . 'schema.json',
+        parseOnly: true,
+        diffOnly: $diffOnly
+      );
     }
 
-    $this->processSchema(schemaConfig: $schemaObject, tablePrefix: $tablePrefix);
+    $this->processSchema(schemaConfig: $schemaObject, diffOnly: $diffOnly, tablePrefix: $tablePrefix);
   }
 
   /**