diff --git a/conda/artiq/build.sh b/conda/artiq/build.sh
index a2bff5018..b3b1f7f73 100644
--- a/conda/artiq/build.sh
+++ b/conda/artiq/build.sh
@@ -3,7 +3,7 @@
 set -e
 
 $PYTHON setup.py install \
-  --prefix=$SP_DIR \
+  --install-lib=$SP_DIR \
   --single-version-externally-managed \
   --record=record.txt \
   --no-compile