Prefer C linkage
diff --git a/src/hb.h b/src/hb.h
index 905fd7b..691adee 100644
--- a/src/hb.h
+++ b/src/hb.h
@@ -35,4 +35,7 @@
 #include "hb-shape.h"
 #include "hb-unicode.h"
 
+HB_BEGIN_DECLS
+HB_END_DECLS
+
 #endif /* HB_H */