diff --git a/planemo_ci_actions.sh b/planemo_ci_actions.sh
index d1feab1..437fdbd 100755
--- a/planemo_ci_actions.sh
+++ b/planemo_ci_actions.sh
@@ -196,7 +196,7 @@ if [ "$MODE" == "combine" ]; then
   [ "$PLANEMO_HTML_REPORT" == "true" ] && planemo test_reports upload/tool_test_output.json --test_output upload/tool_test_output.html
   [ "$PLANEMO_MD_REPORT" == "true" ] && (
     planemo test_reports upload/tool_test_output.json --test_output_markdown upload/tool_test_output.md
-    if [ $(stat -f %z "upload/tool_test_output.md") -gt 1048576 ]; then
+    if [ "$(stat -f %z upload/tool_test_output.md)" -gt 1048576 ]; then
       planemo test_reports upload/tool_test_output.json --test_output_minimal_markdown upload/tool_test_output.md
     fi
   )