diff --git a/deploy.sh b/deploy.sh
index b2adc3d..b80faca 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -3,6 +3,11 @@
 source=public/
 target=apps@spock.ariejan.net:/home/apps/sites/ariejan.net
 
+if [ ! `git symbolic-ref HEAD | grep -q "refs/heads/master"` ] ; then
+    echo "You are not on the 'master' branch. Not deploying."
+    exit
+fi
+
 if [ -d ./public ] ; then
     echo "-- Pruning current static files from ./${source}"
     rm -rf ./${source}