diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a5a536a158bb0c9b28bd7c8810ac572ccabd15c4..091747eda947cb6269a734404d39207b16335f04 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -104,6 +104,8 @@ Python 3 Conda Apple:
   # https://stackoverflow.com/q/60934005; https://reviews.llvm.org/D71579
   - export LDFLAGS="-mlinker-version=519"
   - set -o xtrace
+  # https://gitlab.tiker.net/inducer/ci-support/-/issues/3
+  - PROJECT_INSTALL_FLAGS="--editable"
   - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-and-test-py-project-within-miniconda.sh
   - ". ./build-and-test-py-project-within-miniconda.sh"