diff --git a/.github/workflows/check-standard.yaml b/.github/workflows/check-standard.yaml
index 40698b3d..1f860fec 100644
--- a/.github/workflows/check-standard.yaml
+++ b/.github/workflows/check-standard.yaml
@@ -78,9 +78,10 @@ jobs:
       - name: Check
         env:
           _R_CHECK_CRAN_INCOMING_REMOTE_: false
+          _R_CHECK_LIMIT_CORES_: "TRUE"
         run: |
           options(crayon.enabled = TRUE)
-          rcmdcheck::rcmdcheck(build_args = "--compact-vignettes", args = c("--no-manual", "--as-cran"), error_on = "warning", check_dir = "check")
+          rcmdcheck::rcmdcheck(build_args = "--compact-vignettes", args = c("--no-manual", "--as-cran"), error_on = "error", check_dir = "check")
         shell: Rscript {0}
         continue-on-error: ${{ matrix.config.r == 'devel' }}
 
diff --git a/tests/testthat/test-06-parallel.R b/tests/testthat/test-06-parallel.R
index 3c90515b..beb09f67 100644
--- a/tests/testthat/test-06-parallel.R
+++ b/tests/testthat/test-06-parallel.R
@@ -7,7 +7,7 @@ context("Parallel tests")
 chk <- Sys.getenv("_R_CHECK_LIMIT_CORES_", "")
 
 if (nzchar(chk) && chk == "TRUE") {
-    # use 2 cores in CHECK/Travis/AppVeyor
+    # use 2 cores in CI
     num_workers <- 2L
 } else {
     # use all cores in devtools::test()
@@ -50,12 +50,13 @@ test_that("Parallel computation gives the same results as sequential", {
 
 test_that("Parallel FORK computation gives the same results as sequential", {
     skip_on_cran()
-    skip_on_travis()
+    skip_on_ci()
     skip_on_os("windows")
     skip_if(nzchar(Sys.getenv("R_COVR")), "calculating coverage")
 
-    if (getOption("dtwclust_skip_par_tests", FALSE))
+    if (getOption("dtwclust_skip_par_tests", FALSE)) {
         skip("Parallel tests disabled explicitly.")
+    }
 
     # Also test FORK in Linux
     cat(" - Test FORKs:\n")