diff --git a/tools/snap/generate_dnsplugins_postrefreshhook.sh b/tools/snap/generate_dnsplugins_postrefreshhook.sh
index 4a190d06a..cdccc3d95 100755
--- a/tools/snap/generate_dnsplugins_postrefreshhook.sh
+++ b/tools/snap/generate_dnsplugins_postrefreshhook.sh
@@ -25,7 +25,7 @@ cb_required=\$(grep -oP "version = '\K.*(?=')" \$SNAP/setup.py)
 
 \$SNAP/bin/python3 -c "import sys; from packaging import version; sys.exit(1) if\
   version.parse('\$cb_installed') < version.parse('\$cb_required') else sys.exit(0)" || exit_code=\$?
-if [ "\$exit_code" -eq 1 ]; then
+if [ "\$exit_code" = "1" ]; then
   echo "Certbot is version \$cb_installed but needs to be at least \$cb_required before" \\
     "this plugin can be updated; will try again on next refresh."
   exit 1