diff --git a/src/smblib/smblib.h b/src/smblib/smblib.h
index 1b705176ddb1288e435a7fa6f202cefb85d84a47..6b9907392fb254527e13bd3127b1bfb9124be972 100644
--- a/src/smblib/smblib.h
+++ b/src/smblib/smblib.h
@@ -243,7 +243,7 @@ SMBEXPORT int 		smb_getmsghdr_by_hash(smb_t*, smbmsg_t*, unsigned source
 SMBEXPORT char*		smb_hfieldtype(uint16_t type);
 SMBEXPORT uint16_t	smb_hfieldtypelookup(const char*);
 SMBEXPORT char*		smb_dfieldtype(uint16_t type);
-SMBEXPORT char*		smb_faddrtoa(fidoaddr_t* addr, char* outstr);
+SMBEXPORT char*		smb_faddrtoa(const fidoaddr_t* addr, char* outstr);
 SMBEXPORT char*		smb_netaddr(const net_t* net);
 SMBEXPORT char*		smb_netaddrstr(const net_t* net, char* fidoaddr_buf);
 SMBEXPORT char*		smb_nettype(enum smb_net_type);
diff --git a/src/smblib/smbstr.c b/src/smblib/smbstr.c
index c545de7a8357ecbd1ac9abf174394df440cfec98..11a721ef5c571ee07ed3717aba00271d675b0745 100644
--- a/src/smblib/smbstr.c
+++ b/src/smblib/smbstr.c
@@ -251,7 +251,7 @@ char* smb_zonestr(int16_t zone, char* str)
 /****************************************************************************/
 /* Returns an ASCII string for FidoNet address 'addr'                       */
 /****************************************************************************/
-char* smb_faddrtoa(fidoaddr_t* addr, char* str)
+char* smb_faddrtoa(const fidoaddr_t* addr, char* str)
 {
 	static char buf[64];
     char point[25];