Index: encoder/encoder.c
===================================================================
--- encoder/encoder.c	(revision 717)
+++ encoder/encoder.c	(working copy)
@@ -882,7 +882,7 @@
             }
     }
 
-    h->i_ref1 = X264_MIN( h->i_ref1, h->frames.i_max_ref1 );
+    h->i_ref1 = X264_MIN( h->i_ref1, 1 );
     h->i_ref0 = X264_MIN( h->i_ref0, h->frames.i_max_ref0 );
     h->i_ref0 = X264_MIN( h->i_ref0, h->param.i_frame_reference ); // if reconfig() has lowered the limit
     h->i_ref0 = X264_MIN( h->i_ref0, 16 - h->i_ref1 );