diff --git a/src/sat/smt/arith_diagnostics.cpp b/src/sat/smt/arith_diagnostics.cpp
index 3203bcc4a..7b1d1e80d 100644
--- a/src/sat/smt/arith_diagnostics.cpp
+++ b/src/sat/smt/arith_diagnostics.cpp
@@ -220,7 +220,7 @@ namespace arith {
             expr_ref eq(m.mk_eq(x->get_expr(), y->get_expr()), m);
             if (!is_eq) eq = m.mk_not(eq);
             args.push_back(arith.mk_int(1));
-            args.push_back(eq);
+            args.push_back(std::move(eq));
         };
         rational lc(1);
         for (unsigned i = m_lit_head; i < m_lit_tail; ++i) 
diff --git a/src/sat/smt/q_mbi.cpp b/src/sat/smt/q_mbi.cpp
index a6eb4910d..41d5b867a 100644
--- a/src/sat/smt/q_mbi.cpp
+++ b/src/sat/smt/q_mbi.cpp
@@ -430,7 +430,7 @@ namespace q {
             expr_ref meq = mk_or(meqs);
             expr_ref veq = mk_or(veqs);
             assert_expr(meq);
-            qb.domain_eqs.push_back(veq);
+            qb.domain_eqs.push_back(std::move(veq));
         }
     }
 
diff --git a/src/sat/smt/recfun_solver.cpp b/src/sat/smt/recfun_solver.cpp
index 89688a037..6899f2a56 100644
--- a/src/sat/smt/recfun_solver.cpp
+++ b/src/sat/smt/recfun_solver.cpp
@@ -141,7 +141,7 @@ namespace recfun {
         SASSERT(!is_enabled_guard(guard));
         app_ref dlimit = m_util.mk_num_rounds_pred(m_num_rounds);
         expr_ref_vector core(m);
-        core.push_back(dlimit);
+        core.push_back(std::move(dlimit));
         core.push_back(guard);
         if (!m_guard2pending.contains(guard)) {
             m_disabled_guards.push_back(guard);