diff --git a/common/iso15693tools.c b/common/iso15693tools.c
index c8d413e76..795d1be60 100644
--- a/common/iso15693tools.c
+++ b/common/iso15693tools.c
@@ -14,9 +14,10 @@
 // return: ptr to string
 char *Iso15693sprintUID(char *target, uint8_t *uid) {
 
-    static char tempbuf[2 * 8 + 1] = {0};
+    static char tempbuf[3 * 8 + 1] = {0};
     if (target == NULL)
         target = tempbuf;
+
     sprintf(target, "%02X %02X %02X %02X %02X %02X %02X %02X",
             uid[7], uid[6], uid[5], uid[4],
             uid[3], uid[2], uid[1], uid[0]