diff --git a/pre-build-buildpack b/pre-build-buildpack
index 9099852..daff156 100755
--- a/pre-build-buildpack
+++ b/pre-build-buildpack
@@ -13,14 +13,14 @@ if [ -f $DIR/apt-repositories ]; then
     apt-get update
     apt-get install -y software-properties-common apt-transport-https
     cat "$DIR/apt-repositories" | while read repository; do
-        if [ -n "$repository" ]; then
+        if [ -n "\$repository" ]; then
             add-apt-repository -y "\$repository"
         fi
     done
 fi
 if [ -f $DIR/apt-debconf ]; then
     cat "$DIR/apt-debconf" | while read conf; do
-        if [ -n "$conf" ]; then
+        if [ -n "\$conf" ]; then
             echo \$conf | debconf-set-selections
         fi
     done