diff --git a/src/lightmapper/vk_renderdevice.h b/src/lightmapper/vk_renderdevice.h
index c33593a..030514c 100644
--- a/src/lightmapper/vk_renderdevice.h
+++ b/src/lightmapper/vk_renderdevice.h
@@ -6,6 +6,7 @@
 #include "zvulkan/vulkanbuilders.h"
 #include "framework/matrix.h"
 #include <stdexcept>
+#include <unordered_map>
 
 class VkLevelMesh;
 class VkLightmapper;