diff --git a/tests/arch/xilinx/dsp_fastfir.ys b/tests/arch/xilinx/dsp_fastfir.ys
index b205d42..0067a82 100644
--- a/tests/arch/xilinx/dsp_fastfir.ys
+++ b/tests/arch/xilinx/dsp_fastfir.ys
@@ -63,7 +63,7 @@
 endmodule
 EOT
 
-synth_xilinx -abc9
+synth_xilinx
 cd fastfir_dynamictaps
 select -assert-count 2 t:DSP48E1
 select -assert-none t:* t:DSP48E1 %d t:BUFG %d