diff --git a/conda/artiq-kc705-nist_clock/build.sh b/conda/artiq-kc705-nist_clock/build.sh
index 29f6e5018..f607e39b2 100644
--- a/conda/artiq-kc705-nist_clock/build.sh
+++ b/conda/artiq-kc705-nist_clock/build.sh
@@ -6,7 +6,7 @@ BUILD_SETTINGS_FILE=$HOME/.m-labs/build_settings.sh
 SOC_PREFIX=$PREFIX/lib/python3.5/site-packages/artiq/binaries/kc705-nist_clock
 mkdir -p $SOC_PREFIX
 
-V=1 $PYTHON -m artiq.gateware.targets.kc705_dds -H nist_clock --toolchain vivado $MISOC_EXTRA_VIVADO_CMDLINE
+V=1 $PYTHON -m artiq.gateware.targets.kc705_dds -H nist_clock
 cp misoc_nist_clock_kc705/gateware/top.bit $SOC_PREFIX
 cp misoc_nist_clock_kc705/software/bios/bios.bin $SOC_PREFIX
 cp misoc_nist_clock_kc705/software/runtime/runtime.fbi $SOC_PREFIX
diff --git a/conda/artiq-kc705-nist_qc2/build.sh b/conda/artiq-kc705-nist_qc2/build.sh
index b38c6be57..982c28f0d 100644
--- a/conda/artiq-kc705-nist_qc2/build.sh
+++ b/conda/artiq-kc705-nist_qc2/build.sh
@@ -6,7 +6,7 @@ BUILD_SETTINGS_FILE=$HOME/.m-labs/build_settings.sh
 SOC_PREFIX=$PREFIX/lib/python3.5/site-packages/artiq/binaries/kc705-nist_qc2
 mkdir -p $SOC_PREFIX
 
-V=1 $PYTHON -m artiq.gateware.targets.kc705_dds -H nist_qc2 --toolchain vivado $MISOC_EXTRA_VIVADO_CMDLINE
+V=1 $PYTHON -m artiq.gateware.targets.kc705_dds -H nist_qc2
 cp misoc_nist_qc2_kc705/gateware/top.bit $SOC_PREFIX
 cp misoc_nist_qc2_kc705/software/bios/bios.bin $SOC_PREFIX
 cp misoc_nist_qc2_kc705/software/runtime/runtime.fbi $SOC_PREFIX