diff --git a/src/xenia/gpu/vulkan/vulkan_pipeline_cache.h b/src/xenia/gpu/vulkan/vulkan_pipeline_cache.h
index ceb04efcc..dd82bed31 100644
--- a/src/xenia/gpu/vulkan/vulkan_pipeline_cache.h
+++ b/src/xenia/gpu/vulkan/vulkan_pipeline_cache.h
@@ -12,6 +12,7 @@
 
 #include <cstddef>
 #include <cstring>
+#include <functional>
 #include <memory>
 #include <unordered_map>
 #include <utility>