diff --git a/script/bootstrap b/script/bootstrap
index b8760f6..b9534d9 100755
--- a/script/bootstrap
+++ b/script/bootstrap
@@ -6,7 +6,7 @@ set -e
 # FIX: only sudo if gem home isn't writable
 
 (gem spec bundler -v '~> 1.2.0' > /dev/null 2>&1) ||
-  sudo gem install bundler --no-rdoc --no-ri
+  sudo gem install bundler -v '~> 1.2.0' --no-rdoc --no-ri
 
 # We don't want old config hanging around.