diff --git a/build-in-docker.conf b/build-in-docker.conf
index b731674..0524d0d 100644
--- a/build-in-docker.conf
+++ b/build-in-docker.conf
@@ -1,5 +1,5 @@
-repos="ppa:cordova-ubuntu/ppa"
+repos+=" ppa:cordova-ubuntu/ppa"
 if test -n "${ANDROID_HOME}"; then
-   envs="-e ANDROID_HOME=${ANDROID_HOME}"
-   dirs="-v ${ANDROID_HOME}:${ANDROID_HOME}:ro"
+   envs+=" -e ANDROID_HOME=${ANDROID_HOME}"
+   dirs+=" -v ${ANDROID_HOME}:${ANDROID_HOME}:ro"
 fi