diff --git a/src/drv_maildir.c b/src/drv_maildir.c
index bf26fd6..ad3add7 100644
--- a/src/drv_maildir.c
+++ b/src/drv_maildir.c
@@ -178,9 +178,8 @@ maildir_disown_store( store_t *gctx )
 }
 
 static store_t *
-maildir_own_store( store_conf_t *conf )
+maildir_own_store( store_conf_t *conf ATTR_UNUSED )
 {
-	(void)conf;
 	return 0;
 }
 
@@ -1244,7 +1243,7 @@ maildir_find_new_msgs( store_t *gctx ATTR_UNUSED,
 }
 
 static void
-maildir_set_flags( store_t *gctx, message_t *gmsg, int uid, int add, int del,
+maildir_set_flags( store_t *gctx, message_t *gmsg, int uid ATTR_UNUSED, int add, int del,
                    void (*cb)( int sts, void *aux ), void *aux )
 {
 	maildir_store_t *ctx = (maildir_store_t *)gctx;
@@ -1254,7 +1253,6 @@ maildir_set_flags( store_t *gctx, message_t *gmsg, int uid, int add, int del,
 	int j, ret, ol, fl, bbl, bl, tl;
 	char buf[_POSIX_PATH_MAX], nbuf[_POSIX_PATH_MAX];
 
-	(void) uid;
 	bbl = nfsnprintf( buf, sizeof(buf), "%s/", gctx->path );
 	memcpy( nbuf, gctx->path, bbl - 1 );
 	memcpy( nbuf + bbl - 1, "/cur/", 5 );
@@ -1410,10 +1408,9 @@ maildir_close( store_t *gctx,
 }
 
 static void
-maildir_cancel( store_t *gctx,
+maildir_cancel( store_t *gctx ATTR_UNUSED,
                 void (*cb)( void *aux ), void *aux )
 {
-	(void)gctx;
 	cb( aux );
 }
 
diff --git a/src/sync.c b/src/sync.c
index c8b3424..4b964a9 100644
--- a/src/sync.c
+++ b/src/sync.c
@@ -1597,10 +1597,9 @@ msg_trashed( int sts, void *aux )
 }
 
 static void
-msg_rtrashed( int sts, int uid, copy_vars_t *vars )
+msg_rtrashed( int sts, int uid ATTR_UNUSED, copy_vars_t *vars )
 {
 	SVARS_CHECK_CANCEL_RET;
-	(void)uid;
 	switch (sts) {
 	case SYNC_OK:
 	case SYNC_NOGOOD: /* the message is gone or heavily busted */