diff --git a/.circleci/config.yml b/.circleci/config.yml
index ee2cb8c5b..6dc7ec4df 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -251,7 +251,7 @@ jobs:
           name: Install Python package
           command: |
             source env/bin/activate
-            MACOSX_DEPLOYMENT_TARGET="" DEV_RELEASE=1 \
+            env -u MACOSX_DEPLOYMENT_TARGET DEV_RELEASE=1 \
               CMAKE_BUILD_PARALLEL_LEVEL=`sysctl -n hw.ncpu` \
               pip install . -v
       - run: