diff --git a/.github/workflows/regress.yml b/.github/workflows/regress.yml
index 7eefd28f..9a8291aa 100644
--- a/.github/workflows/regress.yml
+++ b/.github/workflows/regress.yml
@@ -30,6 +30,7 @@ jobs:
         run: |
          export OPENRAM_HOME="${{ github.workspace }}/compiler"
          export OPENRAM_TECH="${{ github.workspace }}/technology"
+         export PDK_ROOT="${{ github.workspace }}/pdk"
          export FREEPDK45="~/FreePDK45"
          # KLAYOUT_PATH breaks klayout installation. Unset it for now...
          unset KLAYOUT_PATH