diff --git a/.github/workflows/package_linux.yml b/.github/workflows/package_linux.yml
index 54ff6f8532d..8cc6de3a9f7 100644
--- a/.github/workflows/package_linux.yml
+++ b/.github/workflows/package_linux.yml
@@ -349,6 +349,8 @@ jobs:
         if: env.TASK_NAMESPACE == 'apt'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Required because the default /tmp is a size-limited tmpfs on some runner images.
+          TMPDIR: ${{ runner.temp }}
         run: |
           # Validate reproducibility. Reprotest runs the build twice
           # inside its own tempdir and doesn't copy artifacts back,