diff --git a/ports/stm32/boards/stm32f091_af.csv b/ports/stm32/boards/stm32f091_af.csv
index 38e134f8a9..8074fd22b7 100644
--- a/ports/stm32/boards/stm32f091_af.csv
+++ b/ports/stm32/boards/stm32f091_af.csv
@@ -87,3 +87,4 @@ PortF,PF3,EVENTOUT,USART7_RX,USART6_CK/USART6_RTS,,,,,,,,,,,,,,
 PortF,PF6,,,,,,,,,,,,,,,,,
 PortF,PF9,TIM15_CH1,USART6_TX,,,,,,,,,,,,,,,
 PortF,PF10,TIM15_CH2,USART6_RX,,,,,,,,,,,,,,,
+PortF,PF11,,,,,,,,,,,,,,,,,