diff --git a/src/Magnum/Trade/Implementation/converterUtilities.h b/src/Magnum/Trade/Implementation/converterUtilities.h
index f856f83b2..6c1d4926f 100644
--- a/src/Magnum/Trade/Implementation/converterUtilities.h
+++ b/src/Magnum/Trade/Implementation/converterUtilities.h
@@ -27,6 +27,7 @@
 
 #include <chrono>
 #include <Corrade/Containers/GrowableArray.h>
+#include <Corrade/Containers/Optional.h>
 
 #include "Magnum/Trade/AbstractImporter.h"
 #include "Magnum/Trade/ImageData.h"