diff --git a/include/modules/sway/workspaces.hpp b/include/modules/sway/workspaces.hpp
index cd806125..fef24bf9 100644
--- a/include/modules/sway/workspaces.hpp
+++ b/include/modules/sway/workspaces.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <unordered_map>
 #include <fmt/format.h>
 #include <gtkmm/button.h>
 #include <gtkmm/label.h>