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-rw-r--r--src/istring.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/istring.h b/src/istring.h
index 921e04487..b77fec4e5 100644
--- a/src/istring.h
+++ b/src/istring.h
@@ -1,5 +1,8 @@
// Interned String type, 100% interned on creation. Comparisons are always just a pointer comparison
+#ifndef __istring_h__
+#define __istring_h__
+
#include <unordered_set>
#include <unordered_map>
#include <set>
@@ -154,3 +157,5 @@ public:
} // namespace cashew
+#endif // __istring_h__
+