diff --git a/travis-upload.sh b/travis-upload.sh
index eed09485..ceae3e84 100644
--- a/travis-upload.sh
+++ b/travis-upload.sh
@@ -15,7 +15,7 @@ COMMITHASH=$(git rev-parse --short HEAD)
 PREFIX=$DAYSSINCERELEASE-$(date +"%H-%M")
 POSTFIX=$COMMITHASH
 
-while [[ $1 ]]; do
+while [ -n $1 ]; do
 FNAME=$1
 FILE_BASE=${FNAME%.*}
 FILE_EXT="${FNAME##*.}"