diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 75ea0be..fd021c0 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -65,13 +65,10 @@ jobs:
         shell: Rscript {0}
 
       - name: Install h5diff
-        run:   |
-              if [ "$RUNNER_OS" == "Linux" ]; then
-                    sudo apt-get install hdf5-tools
-              else
-                    echo "$RUNNER_OS not supported"
-                    exit 1
-              fi
+        run: |
+          if [ "$RUNNER_OS" == "Linux" ]; then
+                sudo apt-get install hdf5-tools
+          fi
         shell: bash
 
 
diff --git a/tests/testthat/helper-skip_if_no_h5diff.R b/tests/testthat/helper-skip_if_no_h5diff.R
index 7e31f79..8368324 100644
--- a/tests/testthat/helper-skip_if_no_h5diff.R
+++ b/tests/testthat/helper-skip_if_no_h5diff.R
@@ -1,7 +1,7 @@
 # helper function to skip tests if h5diff is not available
 skip_if_no_h5diff <- function(){
     testthat::skip_if(
-        !system("h5diff", intern = TRUE),
+        !system("which h5diff", ignore.stdout = TRUE),
         message = "h5diff not available for testing"
     )
 }
\ No newline at end of file