diff --git a/c_src/sqlite3_drv.c b/c_src/sqlite3_drv.c
index 5c1e4ab..c462c2d 100644
--- a/c_src/sqlite3_drv.c
+++ b/c_src/sqlite3_drv.c
@@ -46,11 +46,11 @@ static void fprint_dataset(FILE* log, ErlDrvTermData* dataset, int term_count);
 #endif
 
 // required because driver_free(_binary) are macros in Windows
-void driver_free_fun(void *ptr) { 
+static void driver_free_fun(void *ptr) {
     driver_free(ptr); 
 }
 
-void driver_free_binary_fun(void *ptr) { 
+static void driver_free_binary_fun(void *ptr) {
     driver_free_binary((ErlDrvBinary *) ptr); 
 }
 
@@ -226,16 +226,6 @@ static inline int output_ok(sqlite3_drv_t *drv) {
   return driver_output_term(drv->port, spec, sizeof(spec) / sizeof(spec[0]));
 }
 
-static inline int output_done(sqlite3_drv_t *drv) {
-  // Return {Port, ok}
-  ErlDrvTermData spec[] = {
-      ERL_DRV_PORT, driver_mk_port(drv->port),
-      ERL_DRV_ATOM, drv->atom_done,
-      ERL_DRV_TUPLE, 2
-  };
-  return driver_output_term(drv->port, spec, sizeof(spec) / sizeof(spec[0]));
-}
-
 static inline async_sqlite3_command *make_async_command_statement(
     sqlite3_drv_t *drv, sqlite3_stmt *statement) {
   async_sqlite3_command *result =