diff --git a/.github/workflows/mypy_primer.yml b/.github/workflows/mypy_primer.yml
index 1ff984247fb6..8a04c75b0e2e 100644
--- a/.github/workflows/mypy_primer.yml
+++ b/.github/workflows/mypy_primer.yml
@@ -67,6 +67,7 @@ jobs:
             --debug \
             --additional-flags="--debug-serialize" \
             --output concise \
+            --mypy-install-librt \
             | tee diff_${{ matrix.shard-index }}.txt
           ) || [ $? -eq 1 ]
       - if: ${{ matrix.shard-index == 0 }}