diff --git a/libraries/AP_Baro/AP_Baro_MS5611.cpp b/libraries/AP_Baro/AP_Baro_MS5611.cpp
index fd2ebfd3e7..9fa08554c2 100644
--- a/libraries/AP_Baro/AP_Baro_MS5611.cpp
+++ b/libraries/AP_Baro/AP_Baro_MS5611.cpp
@@ -153,7 +153,7 @@ bool AP_Baro_MS56XX::_init()
 /**
  * MS56XX crc4 method from datasheet for 16 bytes (8 short values)
  */
-static uint16_t crc4(uint16_t *data)
+uint16_t AP_Baro_MS56XX::crc4(uint16_t *data)
 {
     uint16_t n_rem = 0;
     uint8_t n_bit;
diff --git a/libraries/AP_Baro/AP_Baro_MS5611.h b/libraries/AP_Baro/AP_Baro_MS5611.h
index 6e79616dbd..9af6d0c58c 100644
--- a/libraries/AP_Baro/AP_Baro_MS5611.h
+++ b/libraries/AP_Baro/AP_Baro_MS5611.h
@@ -39,6 +39,8 @@ public:
     };
 
     static AP_Baro_Backend *probe(AP_Baro &baro, AP_HAL::OwnPtr<AP_HAL::Device> dev, enum MS56XX_TYPE ms56xx_type = BARO_MS5611);
+
+    static uint16_t crc4(uint16_t *data);
     
 private:
     /*