diff --git a/src/model/model_params.pyg b/src/model/model_params.pyg
index 59899644e..730b574ac 100644
--- a/src/model/model_params.pyg
+++ b/src/model/model_params.pyg
@@ -5,7 +5,7 @@ def_module_params('model',
                           ('v2', BOOL, False, 'use Z3 version 2.x (x <= 16) pretty printer'),
                           ('compact', BOOL, True, 'try to compact function graph (i.e., function interpretations that are lookup tables)'),
                           ('inline_def', BOOL, False, 'inline local function definitions ignoring possible expansion'),
-                          ('user_functions', BOOL, True, 'include user defined functions in model'),
+                          ('user_functions', BOOL, False, 'include user defined functions in model'),
                           ('completion', BOOL, False, 'enable/disable model completion'),
                           ))