diff --git a/src/hb-ot-layout-private.hh b/src/hb-ot-layout-private.hh
index e18222baf..e25f7ac87 100644
--- a/src/hb-ot-layout-private.hh
+++ b/src/hb-ot-layout-private.hh
@@ -80,10 +80,10 @@ struct _hb_ot_layout_context_t
 };
 
 
-void
+HB_INTERNAL void
 _hb_ot_layout_init (hb_face_t *face);
 
-void
+HB_INTERNAL void
 _hb_ot_layout_fini (hb_face_t *face);
 
 
diff --git a/src/hb-private.h b/src/hb-private.h
index 7e292dc24..03c53fb5c 100644
--- a/src/hb-private.h
+++ b/src/hb-private.h
@@ -66,10 +66,6 @@
 #undef MAX
 #define MAX(a,b) ((a) > (b) ? (a) : (b))
 
-#ifndef HB_INTERNAL
-# define HB_INTERNAL extern
-#endif
-
 #undef  ARRAY_LENGTH
 #define ARRAY_LENGTH(__array) ((signed int) (sizeof (__array) / sizeof (__array[0])))
 
@@ -111,6 +107,10 @@
 #define HB_UNUSED
 #endif
 
+#ifndef HB_INTERNAL
+# define HB_INTERNAL extern __attribute__((__visibility__("hidden")))
+#endif
+
 
 #if (defined(__WIN32__) && !defined(__WINE__)) || defined(_MSC_VER)
 #define snprintf _snprintf