diff --git a/parser.cpp b/parser.cpp
index 69ff02368..7b1abe184 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -3127,7 +3127,7 @@ bool parser_use_ast(void)
     env_var_t var = env_get_string(L"fish_new_parser");
     if (var.missing_or_empty())
     {
-        return 0;
+        return 1;
     }
     else
     {