diff --git a/vp8/encoder/mcomp.h b/vp8/encoder/mcomp.h
index 7600f87..83f95c6 100644
--- a/vp8/encoder/mcomp.h
+++ b/vp8/encoder/mcomp.h
@@ -43,8 +43,8 @@
     int *num00,
     const vp8_variance_fn_ptr_t *vf,
     int *mvsadcost[2],
-    int *mvcost[2]
-
+    int *mvcost[2],
+    MV *center_mv
 );
 
 typedef int (fractional_mv_step_fp)