diff --git a/core/assets/run.sh b/core/assets/run.sh
index 034ccbe..d5a08da 100755
--- a/core/assets/run.sh
+++ b/core/assets/run.sh
@@ -114,7 +114,7 @@ if [[ ! -v HYPERKITTY_API_KEY ]]; then
 	exit 1
 fi
 
-if [[ -v HYPERKITTY_URL ]]; then
+if [[ ! -v HYPERKITTY_URL ]]; then
 	echo "HYPERKITTY_URL not set, using the default value of http://mailman-web:8000/hyperkitty"
 	export HYPERKITTY_URL="http://mailman-web:8000/hyperkitty/"
 fi