diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index 10753ce..8c11289 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -227,6 +227,7 @@
     {"shutdown,thermal,battery", 87},
     {"reboot,its_just_so_hard", 88},  // produced by boot_reason_test
     {"reboot,Its Just So Hard", 89},  // produced by boot_reason_test
+    {"usb", 90},
 };
 
 // Converts a string value representing the reason the system booted to an