diff --git a/.github/workflows/check-full.yaml b/.github/workflows/check-full.yaml
index 8f98653d0..bb5bb162b 100644
--- a/.github/workflows/check-full.yaml
+++ b/.github/workflows/check-full.yaml
@@ -56,6 +56,7 @@ jobs:
       - uses: r-lib/actions/check-r-package@v2
         with:
           upload-snapshots: true
-          error-on: 'ifelse(getRversion() > 3.6, "warning", "note")'
+          error-on: 'ifelse(getRversion() > "3.6", "warning", "note")'
         env:
           _R_CHECK_FORCE_SUGGESTS_: false
+          _R_CHECK_STOP_ON_INVALID_NUMERIC_VERSION_INPUTS_: true
diff --git a/R/set-assert-args.R b/R/set-assert-args.R
index db49c4097..7cccd0aa5 100644
--- a/R/set-assert-args.R
+++ b/R/set-assert-args.R
@@ -21,7 +21,7 @@ set_arg_write_tree <- function(write_tree) {
 #' @inheritParams make_transformer
 #' @keywords internal
 assert_transformers <- function(transformers) {
-  version_cutoff <- 2.0
+  version_cutoff <- "2.0"
   no_name <- is.null(transformers$style_guide_name)
   no_version <- is.null(transformers$style_guide_version)
   if (no_name || no_version) {