diff --git a/hw/sd/trace-events b/hw/sd/trace-events
index bfd1d62efc..d7880bcea5 100644
--- a/hw/sd/trace-events
+++ b/hw/sd/trace-events
@@ -37,7 +37,7 @@ sdcard_powerup(void) ""
 sdcard_inquiry_cmd41(void) ""
 sdcard_set_enable(bool current_state, bool new_state) "%u -> %u"
 sdcard_reset(void) ""
-sdcard_set_blocklen(uint16_t length) "0x%04x"
+sdcard_set_blocklen(uint16_t length) "0x%03x"
 sdcard_inserted(bool readonly) "read_only: %u"
 sdcard_ejected(void) ""
 sdcard_erase(void) ""