diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 7aa070813960..eb75fbd11a01 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -753,9 +753,9 @@ efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf),
 		if (window < SYNCHRONISATION_GRANULARITY_NS) {
 			++ptp->invalid_sync_windows;
 		} else if (corrected >= MAX_SYNCHRONISATION_NS) {
-			++ptp->undersize_sync_windows;
-		} else if (corrected < ptp->min_synchronisation_ns) {
 			++ptp->oversize_sync_windows;
+		} else if (corrected < ptp->min_synchronisation_ns) {
+			++ptp->undersize_sync_windows;
 		} else {
 			ngood++;
 			last_good = i;