diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 60ef06e..bcdf126 100755
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -19,8 +19,7 @@ jobs:
     name: ${{ matrix.config.os }} (${{ matrix.config.r }})
 
     strategy:
-      # fail-fast: true
-      fail-fast: false
+      fail-fast: true
       matrix:
         config:
           - {os: macos-latest,   r: 'release'}