diff --git a/PKGBUILD b/PKGBUILD
index d02f57dad85a..c906b31405b7 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -25,7 +25,7 @@ md5sums=('SKIP')
 
 build() {
   # Use ROS environment variables
-  /usr/share/ros-build-tools/clear-ros-env.sh
+  source /usr/share/ros-build-tools/clear-ros-env.sh
   [ -f /opt/ros/indigo/setup.bash ] && source /opt/ros/indigo/setup.bash
 
   # Create build directory