diff --git a/ci/build.sh b/ci/build.sh
index 0ae457b067..038777293f 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -1,3 +1,5 @@
+#! /bin/bash
+
 #sass sass:static/css -r templates/sass/bourbon/lib/bourbon.rb --style :compressed
 
 if [ -z "${GIT_COMMIT}" ]; then