diff --git a/artiq/firmware/ksupport/rtio.rs b/artiq/firmware/ksupport/rtio.rs
index 0c95842ad..19b28df3a 100644
--- a/artiq/firmware/ksupport/rtio.rs
+++ b/artiq/firmware/ksupport/rtio.rs
@@ -96,6 +96,7 @@ pub extern fn input_timestamp(timeout: i64, channel: i32) -> u64 {
         }
 
         if status & RTIO_I_STATUS_OVERFLOW != 0 {
+            csr::rtio::i_overflow_reset_write(1);
             raise!("RTIOOverflow",
                 "RTIO input overflow on channel {0}",
                 channel as i64, 0, 0);