diff --git a/.gitlab/ci_scripts/install_zerossl_issuer.sh b/.gitlab/ci_scripts/install_zerossl_issuer.sh
index d82c2e08fd442487d32f3af3544dac642df53328..d6f41df3a48e28de5f7ac9a39ce25e318ac53393 100755
--- a/.gitlab/ci_scripts/install_zerossl_issuer.sh
+++ b/.gitlab/ci_scripts/install_zerossl_issuer.sh
@@ -12,7 +12,7 @@ set -euo pipefail
 b64tlskey=$(echo -n "${ZEROSSL_TLS_KEY}" | base64 -w0)
 
 # Wait until cert-manager is ready
-"$(dirname "$0")/retry_cmd_until_success.sh" 30 10 "flux get kustomization --status-selector ready=true --no-header | grep 'cert-manager'"
+"$(dirname "$0")/retry_cmd_until_success.sh" 30 10 "flux get kustomization --status-selector ready=true --no-header | grep '^cert-manager'"
 
 # Add ZeroSSL ClusterIssuer
 kubectl apply -n cert-manager -f - <<EOF