diff --git a/stasis/lhtable.h b/stasis/lhtable.h
index 46e5abf..052aa79 100644
--- a/stasis/lhtable.h
+++ b/stasis/lhtable.h
@@ -1,3 +1,5 @@
+#ifndef STASIS_LHTABLE_H
+#define STASIS_LHTABLE_H
 
 #define LH_ENTRY(foo) lh##foo
 
@@ -64,3 +66,5 @@ void LH_ENTRY(openlist)(const struct LH_ENTRY(table) * table,
 */
 const struct LH_ENTRY(pair_t)* LH_ENTRY(readlist)(struct LH_ENTRY(list)* list);
 void LH_ENTRY(closelist)(struct LH_ENTRY(list) * list);
+
+#endif // STASIS_LHTABLE_H