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-rw-r--r--Source/WebCore/dom/SlotAssignment.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Source/WebCore/dom/SlotAssignment.h b/Source/WebCore/dom/SlotAssignment.h
index 0fcd4dfa6..9b9ebe429 100644
--- a/Source/WebCore/dom/SlotAssignment.h
+++ b/Source/WebCore/dom/SlotAssignment.h
@@ -28,6 +28,7 @@
#if ENABLE(SHADOW_DOM) || ENABLE(DETAILS_ELEMENT)
+#include <functional>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Vector.h>