diff --git a/openfpga/src/annotation/rr_gsb_writer_option.cpp b/openfpga/src/annotation/rr_gsb_writer_option.cpp
index 6d155b035..dd4f77577 100644
--- a/openfpga/src/annotation/rr_gsb_writer_option.cpp
+++ b/openfpga/src/annotation/rr_gsb_writer_option.cpp
@@ -2,6 +2,7 @@
  * Memember functions for data structure RRGSBWriterOption
  ******************************************************************************/
 #include <map>
+#include <array>
 #include "vtr_assert.h"
 #include "vtr_log.h"