diff --git a/Brewfile b/Brewfile
index 8465d86f9..2a985f09e 100644
--- a/Brewfile
+++ b/Brewfile
@@ -8,3 +8,4 @@ brew "pkg-config"
 brew "python3"
 brew "tcl-tk"
 brew "xdot"
+brew "bash"
diff --git a/tests/arch/xilinx/tribuf.sh b/tests/arch/xilinx/tribuf.sh
index 636aed12a..bd44395cb 100644
--- a/tests/arch/xilinx/tribuf.sh
+++ b/tests/arch/xilinx/tribuf.sh
@@ -1,5 +1,5 @@
-! ../../../yosys ../common/tribuf.v -qp "synth_xilinx"
-../../../yosys ../common/tribuf.v -qp "synth_xilinx -iopad; \
+! ../../../yosys -qp "synth_xilinx" ../common/tribuf.v
+../../../yosys -qp "synth_xilinx -iopad; \
 select -assert-count 2 t:IBUF; \
 select -assert-count 1 t:INV; \
-select -assert-count 1 t:OBUFT"
+select -assert-count 1 t:OBUFT" ../common/tribuf.v