diff --git a/clay.h b/clay.h
index fd95fbdb..da8a5f9d 100644
--- a/clay.h
+++ b/clay.h
@@ -406,6 +406,9 @@ CLAY__TYPEDEF(Clay_BorderElementConfig, struct {
     Clay_Border bottom;
     Clay_Border betweenChildren;
     Clay_CornerRadius cornerRadius;
+    #ifdef CLAY_EXTEND_CONFIG_BORDER
+    CLAY_EXTEND_CONFIG_BORDER
+    #endif
 });
 
 CLAY__TYPEDEF(Clay_ElementConfigUnion, union {