diff --git a/bin/on-changes b/bin/on-changes
new file mode 100755
index 00000000..f93c82d3
--- /dev/null
+++ b/bin/on-changes
@@ -0,0 +1,8 @@
+#! /usr/bin/env bash
+
+#
+# Prelude
+#
+set -euo pipefail
+
+[[ $(git diff --name-only) == *"$1"* ]]
diff --git a/circle.yml b/circle.yml
index a29fe78d..cc02b4d9 100644
--- a/circle.yml
+++ b/circle.yml
@@ -32,7 +32,7 @@ deployment:
     branch: master
     commands:
       - ./bin/docker-login
-      - [[ $(git diff --name-only) == *'ui/'* ]] && make -C ui publish | sed '/NPM_TOKEN/d'
+      - ./bin/on-changes && make -C ui publish | sed '/NPM_TOKEN/d'
       - make -j2 build | sed '/NPM_TOKEN/d'
       - make -j2 push | sed '/NPM_TOKEN/d'
       - ./bin/deploy