diff --git a/src/ackermannization/lackr_model_constructor.cpp b/src/ackermannization/lackr_model_constructor.cpp
index 63639766f..5a4add54f 100644
--- a/src/ackermannization/lackr_model_constructor.cpp
+++ b/src/ackermannization/lackr_model_constructor.cpp
@@ -247,7 +247,7 @@ private:
                );
         m_app2val.insert(a, result.get()); // memoize
         m_pinned.push_back(a);
-        m_pinned.push_back(result);
+        m_pinned.push_back(std::move(result));
         return true;
     }
     
diff --git a/src/ast/rewriter/macro_replacer.cpp b/src/ast/rewriter/macro_replacer.cpp
index b942276f5..558370407 100644
--- a/src/ast/rewriter/macro_replacer.cpp
+++ b/src/ast/rewriter/macro_replacer.cpp
@@ -96,7 +96,7 @@ struct macro_replacer::macro_replacer_cfg : public default_rewriter_cfg {
             var_subst s(m);
             expr_ref rr = s(def, num, subst_args.data());
             r = rr;
-            m_trail.push_back(rr);
+            m_trail.push_back(std::move(rr));
             m_used_macro_dependencies = m.mk_join(m_used_macro_dependencies, dep);
             // skip proof terms for simplifiers
             return true;
diff --git a/src/muz/spacer/spacer_antiunify.cpp b/src/muz/spacer/spacer_antiunify.cpp
index 1c65b4e29..1fe1529dd 100644
--- a/src/muz/spacer/spacer_antiunify.cpp
+++ b/src/muz/spacer/spacer_antiunify.cpp
@@ -278,9 +278,9 @@ bool naive_convex_closure::compute_closure(anti_unifier& au, ast_manager& m,
     substitute_vars_by_const(m, au.get_generalization(), const_ref, lit3);
 
     expr_ref_vector args(m);
-    args.push_back(lit1);
-    args.push_back(lit2);
-    args.push_back(lit3);
+    args.push_back(std::move(lit1));
+    args.push_back(std::move(lit2));
+    args.push_back(std::move(lit3));
     expr_ref body_with_consts = mk_and(args);
 
     // 3. replace const by var