diff --git a/lib/libutils/ext/snprintk.c b/lib/libutils/ext/snprintk.c
index eea38a26083..a9e93daec04 100644
--- a/lib/libutils/ext/snprintk.c
+++ b/lib/libutils/ext/snprintk.c
@@ -80,7 +80,7 @@
 #define NOLOCK        0x1000	/* don't acquire a tty lock */
 
 /* max size buffer kprintf needs to print a UUID */
-#define KPRINTF_BUFSIZE        36
+#define KPRINTF_BUFSIZE        37
 
 /*
  * The following macro is used to remove const cast-away warnings
@@ -220,7 +220,7 @@ static int uuid2str(char *dst, size_t size, void *ptr)
 	} *uuid = ptr;
 
 	return snprintk(dst, size,
-			"%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x",
+			"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
 			uuid->lo, uuid->mid, uuid->hi_ver,
 			uuid->seq_n[0], uuid->seq_n[1],
 			uuid->seq_n[2],	uuid->seq_n[3],