diff --git a/tools/mac_setup.sh b/tools/mac_setup.sh
index 0b81f86fb1..c917d77f30 100755
--- a/tools/mac_setup.sh
+++ b/tools/mac_setup.sh
@@ -1,7 +1,13 @@
 #!/bin/bash -e
 
-echo "Updating Homebrew"
-brew update
+# Install brew if required.
+if [[ $(command -v brew) == "" ]]; then
+    echo "Installing Hombrew"
+    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
+else
+    echo "Updating Homebrew"
+    brew update || true
+fi
 
 brew install capnp \
              czmq \