(KTRS) – When voters in St. Louis city and St. Louis County head to the polls on Tuesday, there will be a notable absence: the touch-screen voting machines.

The Post-Dispatch reports that election authorities did not have enough time to reprogram the machines after the March 15 presidential primaries. Election officials said that the collection and reprogramming of touch-screen machines typically takes four weeks, one more week than there was between the two voting dates.

Voters in the city and county will have to use optical-scan ballots on Tuesday.