diff --git a/bacnet-stack/include/dlmstp.h b/bacnet-stack/include/dlmstp.h
index da6d7e3a..63f3455c 100644
--- a/bacnet-stack/include/dlmstp.h
+++ b/bacnet-stack/include/dlmstp.h
@@ -118,6 +118,10 @@ extern "C" {
     uint32_t dlmstp_baud_rate(
         void);
 
+    void dlmstp_fill_bacnet_address(
+        BACNET_ADDRESS * src,
+        uint8_t mstp_address);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/bacnet-stack/src/crc.c b/bacnet-stack/src/crc.c
index ac22e091..04af0c22 100644
--- a/bacnet-stack/src/crc.c
+++ b/bacnet-stack/src/crc.c
@@ -35,6 +35,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include "crc.h"
 
 /** @file crc.c  Calculate CRCs */