Prefer C linkage
diff --git a/src/hb-blob.h b/src/hb-blob.h
index d13bb0d..dbbfc90 100644
--- a/src/hb-blob.h
+++ b/src/hb-blob.h
@@ -31,6 +31,7 @@
 
 HB_BEGIN_DECLS
 
+
 typedef enum {
   HB_MEMORY_MODE_DUPLICATE,
   HB_MEMORY_MODE_READONLY,
@@ -82,6 +83,7 @@
 hb_bool_t
 hb_blob_try_writable (hb_blob_t *blob);
 
+
 HB_END_DECLS
 
 #endif /* HB_BLOB_H */