diff --git a/src/gn/hash_table_base.h b/src/gn/hash_table_base.h
index 9e43733..22fcaea 100644
--- a/src/gn/hash_table_base.h
+++ b/src/gn/hash_table_base.h
@@ -9,6 +9,7 @@
 
 #include <stdlib.h>
 #include <type_traits>
+#include <utility>
 
 // IMPORTANT DISCLAIMER:
 //