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-rw-r--r--src/mem/cache/cache.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mem/cache/cache.hh b/src/mem/cache/cache.hh
index 4f9142f7c..7f9130d62 100644
--- a/src/mem/cache/cache.hh
+++ b/src/mem/cache/cache.hh
@@ -52,6 +52,8 @@
#ifndef __MEM_CACHE_CACHE_HH__
#define __MEM_CACHE_CACHE_HH__
+#include <unordered_set>
+
#include "base/misc.hh" // fatal, panic, and warn
#include "enums/Clusivity.hh"
#include "mem/cache/base.hh"