diff --git a/include/gs_types.h b/include/gs_types.h
index 91d2c14..d7c4aa0 100644
--- a/include/gs_types.h
+++ b/include/gs_types.h
@@ -50,6 +50,7 @@
 #ifndef GS_TYPES_H
 #define GS_TYPES_H
 
+#include <compare>
 #include <cstdint>
 #include <vector>
 #include <variant>