diff --git a/board/can.h b/board/can.h
index 6b1294197..9b1200384 100644
--- a/board/can.h
+++ b/board/can.h
@@ -1,7 +1,7 @@
 #pragma once
 #include "can_declarations.h"
 
-const uint8_t PANDA_CAN_CNT = 3U;
-const uint8_t PANDA_BUS_CNT = 3U;
+static const uint8_t PANDA_CAN_CNT = 3U;
+static const uint8_t PANDA_BUS_CNT = 3U;
 
-const unsigned char dlc_to_len[DLC_TO_LEN_ARRAY_SIZE] = {0U, 1U, 2U, 3U, 4U, 5U, 6U, 7U, 8U, 12U, 16U, 20U, 24U, 32U, 48U, 64U};
+static const unsigned char dlc_to_len[] = {0U, 1U, 2U, 3U, 4U, 5U, 6U, 7U, 8U, 12U, 16U, 20U, 24U, 32U, 48U, 64U};
diff --git a/board/can_declarations.h b/board/can_declarations.h
index 8de9bd517..569e2939a 100644
--- a/board/can_declarations.h
+++ b/board/can_declarations.h
@@ -1,8 +1,5 @@
 #pragma once
 
-extern const uint8_t PANDA_CAN_CNT;
-extern const uint8_t PANDA_BUS_CNT;
-
 // bump this when changing the CAN packet
 #define CAN_PACKET_VERSION 4
 
@@ -27,9 +24,6 @@ typedef struct {
   unsigned char data[CANPACKET_DATA_SIZE_MAX];
 } __attribute__((packed, aligned(4))) CANPacket_t;
 
-#define DLC_TO_LEN_ARRAY_SIZE 16
-extern const unsigned char dlc_to_len[DLC_TO_LEN_ARRAY_SIZE];
-
 #define GET_BUS(msg) ((msg)->bus)
 #define GET_LEN(msg) (dlc_to_len[(msg)->data_len_code])
 #define GET_ADDR(msg) ((msg)->addr)