Use git_do where appropriate
diff --git a/git-flow-support b/git-flow-support
index ba4d92f..cdbfc71 100644
--- a/git-flow-support
+++ b/git-flow-support
@@ -169,12 +169,12 @@
 
 	# fetch remote changes
 	if flag fetch; then
-		git fetch -q "$ORIGIN" "$BASE"
+		git_do fetch -q "$ORIGIN" "$BASE"
 	fi
 	require_branch_absent "$BRANCH"
 
 	# create branch
-	git checkout -b "$BRANCH" "$BASE"
+	git_do checkout -b "$BRANCH" "$BASE"
 
 	echo
 	echo "Summary of actions:"