diff --git a/.github/workflows/check-bioc-devel.yml b/.github/workflows/check-bioc-devel.yml
index fe4fbdc..e577ab4 100644
--- a/.github/workflows/check-bioc-devel.yml
+++ b/.github/workflows/check-bioc-devel.yml
@@ -221,7 +221,7 @@ jobs:
           rcmdcheck::rcmdcheck(
               args = c("--no-manual", "--no-vignettes", "--timings"),
               build_args = c("--no-manual", "--keep-empty-dirs", "--no-resave-data"),
-              error_on = "warning",
+              error_on = "error",
               check_dir = "check"
           )
         shell: Rscript {0}
diff --git a/.github/workflows/check-bioc.yml b/.github/workflows/check-bioc.yml
index 6cada09..70659fb 100644
--- a/.github/workflows/check-bioc.yml
+++ b/.github/workflows/check-bioc.yml
@@ -221,7 +221,7 @@ jobs:
           rcmdcheck::rcmdcheck(
               args = c("--no-manual", "--no-vignettes", "--timings"),
               build_args = c("--no-manual", "--keep-empty-dirs", "--no-resave-data"),
-              error_on = "warning",
+              error_on = "error",
               check_dir = "check"
           )
         shell: Rscript {0}