Don't assume git aliases.
diff --git a/git-flow-support b/git-flow-support
index 17bdd94..61e19a7 100644
--- a/git-flow-support
+++ b/git-flow-support
@@ -47,7 +47,7 @@
 	git fetch -q $ORIGIN
 	git config branch.$BRANCH.remote $ORIGIN
 	git config branch.$BRANCH.merge refs/heads/$BRANCH
-	git co $BRANCH
+	git checkout $BRANCH
 
 	echo
 	echo "Summary of actions:"