diff --git a/src/api/api_solver.cpp b/src/api/api_solver.cpp
index c8b1723f1..6fc0c1c72 100644
--- a/src/api/api_solver.cpp
+++ b/src/api/api_solver.cpp
@@ -130,6 +130,9 @@ extern "C" {
         Z3_TRY;
         LOG_Z3_solver_set_params(c, s, p);
         RESET_ERROR_CODE();
+        param_descrs r;
+        to_solver_ref(s)->collect_param_descrs(r);
+        to_param_ref(p).validate(r);
         if (to_solver(s)->m_solver) {
             bool old_model = to_solver(s)->m_params.get_bool("model", true);
             bool new_model = to_param_ref(p).get_bool("model", true);
diff --git a/src/api/api_tactic.cpp b/src/api/api_tactic.cpp
index 7dce33971..adfd0fb71 100644
--- a/src/api/api_tactic.cpp
+++ b/src/api/api_tactic.cpp
@@ -450,6 +450,9 @@ extern "C" {
         Z3_TRY;
         LOG_Z3_tactic_apply_ex(c, t, g, p);
         RESET_ERROR_CODE();
+        param_descrs pd;
+        to_tactic_ref(t)->collect_param_descrs(pd);
+        to_param_ref(p).validate(pd);
         Z3_apply_result r = _tactic_apply(c, t, g, to_param_ref(p));
         RETURN_Z3(r);
         Z3_CATCH_RETURN(0);