Minor
diff --git a/src/hb-fallback-shape.cc b/src/hb-fallback-shape.cc
index 4c9a3b3..48aba73 100644
--- a/src/hb-fallback-shape.cc
+++ b/src/hb-fallback-shape.cc
@@ -87,7 +87,8 @@
  */
 
 hb_bool_t
-_hb_fallback_shape (hb_font_t          *font,
+_hb_fallback_shape (hb_shape_plan_t    *shape_plan,
+		    hb_font_t          *font,
 		    hb_buffer_t        *buffer,
 		    const hb_feature_t *features HB_UNUSED,
 		    unsigned int        num_features HB_UNUSED)