Index: sys/compat/linuxkpi/common/include/linux/uuid.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/uuid.h
+++ sys/compat/linuxkpi/common/include/linux/uuid.h
@@ -33,6 +33,8 @@
 #ifndef	_LINUXKPI_LINUX_UUID_H
 #define	_LINUXKPI_LINUX_UUID_H
 
+#define	UUID_STRING_LEN	36
+
 typedef struct {
 	char	x[16];
 } guid_t;