diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index a3ac618..6460719 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -27,6 +27,7 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       R_KEEP_PKG_SOURCE: yes
+      RGL_USE_NULL: true
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 27d4528..7ec212f 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -13,6 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      RGL_USE_NULL: true
 
     steps:
       - uses: actions/checkout@v3