diff --git a/kernel/module.c b/kernel/module.c
index aa9348aa993..5242890c4cd 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1866,7 +1866,9 @@ static void free_module(struct module *mod)
 
 	/* We leave it in list to prevent duplicate loads, but make sure
 	 * that noone uses it while it's being deconstructed. */
+	mutex_lock(&module_mutex);
 	mod->state = MODULE_STATE_UNFORMED;
+	mutex_unlock(&module_mutex);
 
 	/* Remove dynamic debug info */
 	ddebug_remove_module(mod->name);