Before scuttling out of town for the Memorial Day recess, Congress met a key deadline by passing a short-term extension of federal highway funds.

The punt by lawmakers means they’ll have to pass another bill by July 31 to keep road and infrastructure projects funded, however. And it won’t be as easy then to replenish the Highway Trust Fund, which pays for the projects.

The Highway Trust Fund relies on a federal gas tax for its money, and it is expected to run dry in July. That means lawmakers will have to find a different funding source.