diff --git a/extmod/modbtree.c b/extmod/modbtree.c
index 2a08a9cab..88129e210 100644
--- a/extmod/modbtree.c
+++ b/extmod/modbtree.c
@@ -60,7 +60,7 @@ STATIC const mp_obj_type_t btree_type;
         }
 
 void __dbpanic(DB *db) {
-    printf("__dbpanic(%p)\n", db);
+    mp_printf(&mp_plat_print, "__dbpanic(%p)\n", db);
 }
 
 STATIC mp_obj_btree_t *btree_new(DB *db) {