diff --git a/.github/workflows/R-CMD-check-occasional.yaml b/.github/workflows/R-CMD-check-occasional.yaml
index 0aef714f1..1986f245c 100644
--- a/.github/workflows/R-CMD-check-occasional.yaml
+++ b/.github/workflows/R-CMD-check-occasional.yaml
@@ -1,6 +1,6 @@
 on:
   schedule:
-   - cron: '17 13 21 * *' # 21st of month at 13:17 UTC
+   - cron: '17 13 22 * *' # 22nd of month at 13:17 UTC
 
 # A more complete suite of checks to run monthly; each PR/merge need not pass all these, but they should pass before CRAN release
 name: R-CMD-check-occasional
@@ -93,15 +93,6 @@ jobs:
           install.packages("remotes")
           remotes::install_deps(dependencies=TRUE, force=TRUE)
 
-          # we define this in data.table namespace, but it appears to be exec
-          if (!exists("isFALSE", "package:base")) { # R>=3.5.0
-            if (!exists("isFALSE", asNamespace("data.table"))) {
-              message("isFALSE not found in base, but data.table did not define it either!\n")
-            }
-            # attempt defining it here as a workaround...
-            isFALSE = function(x) is.logical(x) && length(x) == 1L && !is.na(x) && !x
-          }
-
           other_deps_expr = parse('inst/tests/other.Rraw', n=1L)
           eval(other_deps_expr)
           other_pkgs = get(as.character(other_deps_expr[[1L]][[2L]]))