diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 9cf5b68..ee7108b 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -39,7 +39,7 @@ jobs:
           http-user-agent: ${{ matrix.config.http-user-agent }}
           use-public-rspm: true
       - name: macOS openbabel
-        if: matrix.config.os == 'macos-latest'
+        if: contains(matrix.config.os, 'macos')
         run: |
           brew install open-babel
       - name: ubuntu openbabel
diff --git a/vignettes/volcalc.Rmd b/vignettes/volcalc.Rmd
index ca7b439..512ba6b 100644
--- a/vignettes/volcalc.Rmd
+++ b/vignettes/volcalc.Rmd
@@ -12,7 +12,6 @@ knitr::opts_chunk$set(
   collapse = TRUE,
   comment = "#>"
 )
-library(ChemmineOB)
 ```
 
 ```{r setup}