diff --git a/tests/scripts/github-action-helper.sh b/tests/scripts/github-action-helper.sh
index 0b8c0bffe..67e74940f 100755
--- a/tests/scripts/github-action-helper.sh
+++ b/tests/scripts/github-action-helper.sh
@@ -50,7 +50,7 @@ function use_local_disk() {
   else
     # it's the hosted runner!
     sudo sgdisk --zap-all --clear --mbrtogpt -g -- "${BLOCK}"
-    sudo dd if=/dev/zero of="${BLOCK}" bs=1M count=10 oflag=direct
+    sudo dd if=/dev/zero of="${BLOCK}" bs=1M count=10 oflag=direct,dsync
     sudo parted -s "${BLOCK}" mklabel gpt
   fi
   sudo lsblk
diff --git a/tests/scripts/multi-node/build-rook.sh b/tests/scripts/multi-node/build-rook.sh
index 3dc475681..e9617924c 100755
--- a/tests/scripts/multi-node/build-rook.sh
+++ b/tests/scripts/multi-node/build-rook.sh
@@ -50,7 +50,7 @@ function purge_ceph_vms {
     vagrant ssh "$i" -c "cat << 'EOF' > /tmp/purge-ceph.sh
     sudo rm -rf /var/lib/rook
     for disk in \$(sudo blkid | awk '/ROOK/ {print \$1}' | sed 's/[0-9]://' | uniq); do
-    sudo dd if=/dev/zero of=\$disk bs=1M count=20 oflag=direct
+    sudo dd if=/dev/zero of=\$disk bs=1M count=20 oflag=direct,dsync
     done
 EOF"
     vagrant ssh "$i" -c "bash /tmp/purge-ceph.sh"