diff --git a/releng.control/addRepoProperties.sh b/releng.control/addRepoProperties.sh
index 931e509c1efad5b8afa2e4c49db8536e8f02c2d2..16bde084a6fe58f7b15ac220ec59a5861c8dd2ef 100644
--- a/releng.control/addRepoProperties.sh
+++ b/releng.control/addRepoProperties.sh
@@ -43,7 +43,7 @@ echo "BUILD_BRANCH: ${BUILD_BRANCH}";
 echo "BUILD_ID: ${BUILD_ID}";
 echo "STATS_TAG_SUFFIX: ${STATS_TAG_SUFFIX}";
 
-if [[ \( ! \( -z "${BUILD_BRANCH"} \) \) && \( ! \( -z "${BUILD_ID}" \) \) ]]
+if [[ ( ! ( -z "${BUILD_BRANCH}" ) ) && ( ! ( -z "${BUILD_ID}" ) ) ]]
 then 
  MIRRORURL="/webtools/downloads/drops/${BUILD_BRANCH}/${BUILD_ID}/repository/"
 else