diff --git a/src/bin/listusb.cpp b/src/bin/listusb.cpp
index 5b1e5f18dd..0b15a96d54 100644
--- a/src/bin/listusb.cpp
+++ b/src/bin/listusb.cpp
@@ -757,8 +757,8 @@ DumpAudioStreamCSEndpointDescriptor(
 		"Unknown (%u)"
 	};
 
-	const char* units = descriptor->lock_delay_units > 4
-		? aUnits[4] : aUnits[descriptor->lock_delay_units];
+	const char* units = descriptor->lock_delay_units >= 4
+		? aUnits[3] : aUnits[descriptor->lock_delay_units];
 
 	printf("                    Lock Delay Units .. %u (%s)\n",
 		descriptor->lock_delay_units, units);