diff --git a/package/common/util.sh b/package/common/util.sh
index d7e7dfb20..dc09122b0 100755
--- a/package/common/util.sh
+++ b/package/common/util.sh
@@ -46,7 +46,7 @@ fi
 function set_branch () 
 {
     echo "Setting current_branch"
-    if [ -z ${TRAVIS_BRANCH} ] && [ -z ${GIT_BRANCH+x} ] && [ -z ${APPVEYOR_REPO_BRANCH+x} ]; then
+    if [ -z ${TRAVIS_BRANCH+x} ] && [ -z ${GIT_BRANCH+x} ] && [ -z ${APPVEYOR_REPO_BRANCH+x} ]; then
     current_branch=$(git symbolic-ref HEAD | sed 's!refs\/heads\/!!')
     else
         current_branch="unknown"