diff --git a/conda/artiq-kc705-nist_qc1/build.sh b/conda/artiq-kc705-nist_qc1/build.sh
index 03bcadd9a..c0f1c9de9 100644
--- a/conda/artiq-kc705-nist_qc1/build.sh
+++ b/conda/artiq-kc705-nist_qc1/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-qc1
 mkdir -p $SOC_PREFIX
 
-$PYTHON -m artiq.gateware.targets.kc705 -H qc1 $MISOC_EXTRA_ISE_CMDLINE
+$PYTHON -m artiq.gateware.targets.kc705 -H qc1 --toolchain vivado $MISOC_EXTRA_VIVADO_CMDLINE
 cp misoc_nist_qc1_kc705/gateware/top.bit $SOC_PREFIX
 cp misoc_nist_qc1_kc705/software/bios/bios.bin $SOC_PREFIX
 cp misoc_nist_qc1_kc705/software/runtime/runtime.fbi $SOC_PREFIX
diff --git a/conda/artiq-kc705-nist_qc2/build.sh b/conda/artiq-kc705-nist_qc2/build.sh
index 38cac5ab7..c9094cc96 100644
--- a/conda/artiq-kc705-nist_qc2/build.sh
+++ b/conda/artiq-kc705-nist_qc2/build.sh
@@ -6,7 +6,7 @@ BUILD_SETTINGS_FILE=$HOME/.m-labs/build_settings.sh
 SOC_PREFIX=$PREFIX/lib/python3.5/site-packages/artiq/binaries/kc705-qc2
 mkdir -p $SOC_PREFIX
 
-$PYTHON -m artiq.gateware.targets.kc705 -H qc2 $MISOC_EXTRA_ISE_CMDLINE
+$PYTHON -m artiq.gateware.targets.kc705 -H qc2 --toolchain vivado $MISOC_EXTRA_VIVADO_CMDLINE
 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