diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index eac1dcf..09cc33c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -136,6 +136,7 @@ jobs:
             S2GEOMETRY_VERSION=${{ env.S2GEOMETRY_VERSION }}
             S2GEOGRAPHY_VERSION=${{ env.S2GEOGRAPHY_VERSION }}
             CXX_STANDARD=${{ env.CXX_STANDARD }}
+            PROJECT_DIR=${{ runner.workspace }}
           CIBW_BEFORE_ALL: ./ci/install_3rdparty.sh
           CIBW_BEFORE_ALL_WINDOWS: ci\install_3rdparty.cmd
           CIBW_BEFORE_BUILD_WINDOWS: pip install delvewheel