diff --git a/.github/scripts/gen-docs.sh b/.github/scripts/gen-docs.sh
index edb57fc8368..d7e149a3675 100755
--- a/.github/scripts/gen-docs.sh
+++ b/.github/scripts/gen-docs.sh
@@ -153,5 +153,5 @@ generate_docs() {
     export -f generate_docs
 
 parthreads=$(($(nproc) * 2))
-parallel -j ${parthreads} chart_runner '2>&1' ::: ${1}
+parallel -j ${parthreads} chart_runner '2>&1' ::: ${1[@]}
 echo "Starting post-processing"