diff --git a/src/libusbmuxd.c b/src/libusbmuxd.c
index 1097f1d..a183919 100644
--- a/src/libusbmuxd.c
+++ b/src/libusbmuxd.c
@@ -1011,6 +1011,11 @@
 	memset(devinfo->udid, '\0', sizeof(devinfo->udid));
 	memcpy(devinfo->udid, dev->serial_number, sizeof(devinfo->udid));
 
+	if (strlen(devinfo->udid) == 24) {
+		memmove(&devinfo->udid[9], &devinfo->udid[8], 17);
+		devinfo->udid[8] = '-';
+	}
+
 	if (strcasecmp(devinfo->udid, "ffffffffffffffffffffffffffffffffffffffff") == 0) {
 		sprintf(devinfo->udid + 32, "%08x", devinfo->handle);
 	}