diff --git a/ci/build.sh b/ci/build.sh
index 3edbd27ca..0141692e2 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -19,7 +19,7 @@ fi
 # Allow multiple stacks to be selected
 if [ $# -gt 0 ]
 then
-  export STACKS_LIST="$@"
+  export source STACKS_LIST="$@"
   echo "STACKS_LIST=$STACKS_LIST"
 fi