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-rw-r--r--src/common/apply_permutation.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/common/apply_permutation.h b/src/common/apply_permutation.h
index 4fd952686..8684f14ce 100644
--- a/src/common/apply_permutation.h
+++ b/src/common/apply_permutation.h
@@ -30,6 +30,8 @@
// This algorithm is adapted from Raymond Chen's code:
// https://blogs.msdn.microsoft.com/oldnewthing/20170109-00/?p=95145
+#pragma once
+
#include <vector>
#include <functional>
#include "misc_log_ex.h"