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-rw-r--r--layers/core_validation.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/layers/core_validation.h b/layers/core_validation.h
index 092eaac3..8d8941f5 100644
--- a/layers/core_validation.h
+++ b/layers/core_validation.h
@@ -37,6 +37,7 @@
#include <vector>
#include <unordered_map>
#include <memory>
+#include <functional>
using std::vector;