diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 288495b78a954374ba5a757e35145ffd60bc00dc..e144c90bb4734ec98c6e0b6571b2139fe7722416 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,4 +10,4 @@ ctest-http:
     URL: https://www.incal.net/
   script:
     - sed -e "s,@URL@,$URL,g" < test/http/config.json > config.json
-    - with-container --mount=type=bind,source=$PWD/config.json,destination=/etc/service-prober.json --env=SERVICE_PROBER_CONFIG=/etc/service-prober.json $IMAGE_TAG ./test/test.sh
+    - with-container --mount=type=bind,source=$PWD/config.json,destination=/etc/service-prober.json --env=SERVICE_PROBER_CONFIG=/etc/service-prober.json --env=SERVICE_PROBER_HTTP_ADDR=:5521 --expose=5521 $IMAGE_TAG ./test/test.sh
diff --git a/test/test.sh b/test/test.sh
index 43966a8ad64cfd8a82b5a5c08bda0bc658ea4057..b5d9e557a83d002e82ba0f854bbb2bf4493d9f49 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -10,7 +10,7 @@ while [ $count -lt 120 ]; do
         exit 0
     fi
 
-    echo "probe_success=${value}"
+    [ -n "$value" ] && echo "probe_success=${value}"
 
     sleep 1
 done