diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 3f2488928..5d22ac00b 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -27,7 +27,7 @@ jobs:
           - {os: macOS-latest, r: 'release', rtools: ''}
           - {os: windows-latest, r: 'devel', rtools: ''}
           - {os: windows-latest, r: 'release', rtools: ''}
-          - {os: windows-latest, r: 'oldrel', rtools: ''}
+          - {os: windows-latest, r: 'oldrel', rtools: '42'}
           - {os: ubuntu-20.04, r: 'devel', rtools: ''}
           - {os: ubuntu-20.04, r: 'release', rtools: ''}
           - {os: ubuntu-20.04, r: 'oldrel', rtools: ''}