Prefer C linkage
diff --git a/src/hb-shape.h b/src/hb-shape.h
index d5210f3..48f1a55 100644
--- a/src/hb-shape.h
+++ b/src/hb-shape.h
@@ -33,6 +33,7 @@
 
 HB_BEGIN_DECLS
 
+
 typedef struct _hb_feature_t {
   hb_tag_t      tag;
   uint32_t      value;