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-rw-r--r--testing/range_set.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/testing/range_set.h b/testing/range_set.h
index 87cbee910b..6ed24bd83c 100644
--- a/testing/range_set.h
+++ b/testing/range_set.h
@@ -5,6 +5,8 @@
#ifndef TESTING_RANGE_SET_H_
#define TESTING_RANGE_SET_H_
+#include <stddef.h>
+
#include <set>
#include <utility>