diff --git a/sasl_defs.c b/sasl_defs.c
index 5b4dc97c..a51d5a75 100644
--- a/sasl_defs.c
+++ b/sasl_defs.c
@@ -141,15 +141,15 @@ static int sasl_log(void *context, int level, const char *message)
 
 static sasl_callback_t sasl_callbacks[] = {
 #ifdef ENABLE_SASL_PWDB
-   { SASL_CB_SERVER_USERDB_CHECKPASS, sasl_server_userdb_checkpass, NULL },
+   { SASL_CB_SERVER_USERDB_CHECKPASS, (int(*)(void))sasl_server_userdb_checkpass, NULL },
 #endif
 
 #ifdef ENABLE_SASL
-   { SASL_CB_LOG, sasl_log, NULL },
+   { SASL_CB_LOG, (int(*)(void))sasl_log, NULL },
 #endif
 
 #ifdef HAVE_SASL_CB_GETCONF
-   { SASL_CB_GETCONF, sasl_getconf, NULL },
+   { SASL_CB_GETCONF, (int(*)(void))sasl_getconf, NULL },
 #endif
 
    { SASL_CB_LIST_END, NULL, NULL }