diff --git a/.travis.yml b/.travis.yml
index d2722414..3203fb95 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: node_js
-node_js:
-  - 'lts/*'
+node_js: lts/*
 
 script:
-  - npm run lint
-  - npm run build
+- bash .travis/prevent-base-master.sh
+- bash .travis/omit-dist.sh
+- npm run lint
+- npm run build
diff --git a/.travis/omit-dist.sh b/.travis/omit-dist.sh
new file mode 100755
index 00000000..f107a6b9
--- /dev/null
+++ b/.travis/omit-dist.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+if [ $TRAVIS_BRANCH == "develop" ] && $(git diff --name-only $TRAVIS_COMMIT_RANGE | grep -qE "^(demo/)?dist/"); then
+	echo 'Build output ("dist" and "demo/dist") not permitted in develop' >&2
+	exit 1
+fi
diff --git a/.travis/prevent-base-master.sh b/.travis/prevent-base-master.sh
new file mode 100755
index 00000000..54536a66
--- /dev/null
+++ b/.travis/prevent-base-master.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+if [ "$TRAVIS_PULL_REQUEST" != "false" ] && [ $TRAVIS_BRANCH == "master" ] && $(git diff --name-only $TRAVIS_COMMIT_RANGE | grep -q "^src/"); then
+	echo 'The base branch for pull requests must be "develop"' >&2
+	exit 1
+fi