diff --git a/hack/image-sign.sh b/hack/image-sign.sh
index e96bf8b07..6913ad268 100755
--- a/hack/image-sign.sh
+++ b/hack/image-sign.sh
@@ -7,11 +7,11 @@ SIGN_IMAGE=${SIGN_IMAGE:-"0"}
 CLUSTER_OPERATOR_IMAGE=${CLUSTER_OPERATOR_IMAGE:-"${IMAGE_HUB}/cluster-operator:${IMAGE_TAG}"}
 FLEET_MANAGER_IMAGE=${FLEET_MANAGER_IMAGE:-"${IMAGE_HUB}/fleet-manager:${IMAGE_TAG}"}
 
-if [ $SIGN_IMAGE = "1" ]; then
-    echo "Sign image: "${CLUSTER_OPERATOR_IMAGE}
-    cosign sign --yes ${CLUSTER_OPERATOR_IMAGE}
-    echo "Sign image: "${FLEET_MANAGER_IMAGE}
-    cosign sign --yes ${FLEET_MANAGER_IMAGE}
+if [ "$SIGN_IMAGE" = "1" ]; then
+    echo "Sign image: ""${CLUSTER_OPERATOR_IMAGE}"
+    cosign sign --yes "${CLUSTER_OPERATOR_IMAGE}"
+    echo "Sign image: ""${FLEET_MANAGER_IMAGE}"
+    cosign sign --yes "${FLEET_MANAGER_IMAGE}"
 else
     echo "Warning: The build image is not signed"
 fi