diff --git a/packages/core/build/flecks.hooks.js b/packages/core/build/flecks.hooks.js
index 9df1a94..7634c3e 100644
--- a/packages/core/build/flecks.hooks.js
+++ b/packages/core/build/flecks.hooks.js
@@ -74,6 +74,20 @@ export const hooks = {
     // Do something with Class...
   },
 
+  /**
+   * Invoked when a hook is HMR'd. Throw to abort hot reload and restart application.
+   * Must be synchronous.
+   *
+   * @param {string} hook The hook that was updated.
+   * @param {string} path The path of the fleck implementing the updated hook.
+   * @invokeSequential
+   */
+  '@flecks/core.hmr.hook': (hook, path) => {
+    if ('@my/fleck.some.hook' === hook) {
+      throw new Error('hook too volatile, restart!');
+    }
+  },
+
   /**
    * Invoked when flecks is building a fleck dependency graph.
    * @param {Digraph} graph The dependency graph.