diff --git a/src/smt/params/preprocessor_params.cpp b/src/smt/params/preprocessor_params.cpp
index 4799b8b9f..9ad787c2a 100644
--- a/src/smt/params/preprocessor_params.cpp
+++ b/src/smt/params/preprocessor_params.cpp
@@ -23,6 +23,7 @@ void preprocessor_params::updt_local_params(params_ref const & _p) {
     smt_params_helper p(_p);
     m_macro_finder            = p.macro_finder();
     m_pull_nested_quantifiers = p.pull_nested_quantifiers();
+    m_refine_inj_axiom        = p.refine_inj_axioms();
 }
 
 void preprocessor_params::updt_params(params_ref const & p) {
diff --git a/src/smt/params/smt_params_helper.pyg b/src/smt/params/smt_params_helper.pyg
index 50bb6422b..869b8cdc4 100644
--- a/src/smt/params/smt_params_helper.pyg
+++ b/src/smt/params/smt_params_helper.pyg
@@ -14,6 +14,7 @@ def_module_params(module_name='smt',
                           ('delay_units', BOOL, False, 'if true then z3 will not restart when a unit clause is learned'),
                           ('delay_units_threshold', UINT, 32, 'maximum number of learned unit clauses before restarting, ingored if delay_units is false'),
                           ('pull_nested_quantifiers', BOOL, False, 'pull nested quantifiers'),
+                          ('refine_inj_axioms', BOOL, True, 'refine injectivity axioms'),
                           ('soft_timeout', UINT, 0, 'soft timeout (0 means no timeout)'),
                           ('mbqi', BOOL, True, 'model based quantifier instantiation (MBQI)'),
                           ('mbqi.max_cexs', UINT, 1, 'initial maximal number of counterexamples used in MBQI, each counterexample generates a quantifier instantiation'),