diff --git a/libraries/libvapours/include/vapours/util/util_uuid.hpp b/libraries/libvapours/include/vapours/util/util_uuid.hpp
index f876fb5eb..fee48adb1 100644
--- a/libraries/libvapours/include/vapours/util/util_uuid.hpp
+++ b/libraries/libvapours/include/vapours/util/util_uuid.hpp
@@ -17,6 +17,7 @@
 #pragma once
 #include <vapours/common.hpp>
 #include <vapours/assert.hpp>
+#include <vapours/util/util_format_string.hpp>
 
 namespace ams::util {