"Eva is doing very well today. It was a minor incident and she is ready to return to work," said spokeswoman Liza Anderson. "She's very thankful to everybody for their get-well wishes."
Construction material being used for the ABC series hit Longoria on the head, Anderson said. The actress was examined at a hospital but didn't require treatment.
She's scheduled to be back at work by Monday.
Longoria, 30, plays former runway model Gabrielle Solis on "Desperate Housewives," a dark satire about life in suburbia. The show recently received 15 Emmy nominations from the Academy of Television Arts & Sciences.