diff --git a/monitor/l2cap.c b/monitor/l2cap.c
index 59a3206..f4b54af 100644
--- a/monitor/l2cap.c
+++ b/monitor/l2cap.c
@@ -1999,7 +1999,7 @@ static void print_hex_field(const char *label, const uint8_t *data,
 static void print_uuid(const char *label, const void *data, uint16_t size)
 {
 	const char *str;
-	char uuidstr[36];
+	char uuidstr[MAX_LEN_UUID_STR];
 
 	switch (size) {
 	case 2:
diff --git a/monitor/uuid.h b/monitor/uuid.h
index 6ffc0ee..22d2363 100644
--- a/monitor/uuid.h
+++ b/monitor/uuid.h
@@ -24,6 +24,8 @@
 
 #include <stdint.h>
 
+#define MAX_LEN_UUID_STR 37
+
 const char *uuid16_to_str(uint16_t uuid);
 const char *uuid32_to_str(uint32_t uuid);
 const char *uuidstr_to_str(const char *uuid);