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-rw-r--r--kernel/hashlib.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/hashlib.h b/kernel/hashlib.h
index 2da53dd8a..3c824b8c3 100644
--- a/kernel/hashlib.h
+++ b/kernel/hashlib.h
@@ -10,6 +10,7 @@
// -------------------------------------------------------
#ifndef HASHLIB_H
+#define HASHLIB_H
#include <stdexcept>
#include <algorithm>