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-rw-r--r--layout/style/PseudoStyleType.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/layout/style/PseudoStyleType.h b/layout/style/PseudoStyleType.h
index 6804b500c3..88eb4e4cf8 100644
--- a/layout/style/PseudoStyleType.h
+++ b/layout/style/PseudoStyleType.h
@@ -7,6 +7,7 @@
#ifndef mozilla_PseudoStyleType_h
#define mozilla_PseudoStyleType_h
+#include <cstddef>
#include <cstdint>
#include <iosfwd>