diff --git a/src/Viewer/GraphicsPresets.hxx b/src/Viewer/GraphicsPresets.hxx
index a979d1a3d..e1d7693f9 100644
--- a/src/Viewer/GraphicsPresets.hxx
+++ b/src/Viewer/GraphicsPresets.hxx
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <memory>
 #include <string>
 #include <vector>