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Listeners hearing an ambiguous speech sound flexibly adjust their phonetic categories in accordance with lipread information telling what the phoneme should be (recalibration). Here, we tested the stability of lipread-induced recalibration over time. Listeners were exposed to an ambiguous sound halfway between /t / and /p / that was dubbed onto a face articulating either /t / or /p/. When tested immediately, listeners exposed to lipread /t / were more likely to categorize the ambiguous sound as /t / than listeners exposed to /p/. This aftereffect dissipated quickly with prolonged testing and did not reappear after a 24 hours delay. Recalibration of phonetic categories is thus a fragile phenomenon